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MRP Considerations

Former Member
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Dear Experts ,

Please suggest for the following scenario

MRP Should not consider the Un-restricted stock of the entire Plant

What setting need to done

MRP sholud not consider the Firmed planned orders for Net requirement calculation

What setting need to be done

Finally what is the configuration setting for the net requirement calculation

For example Net Requirements = Gross requirements- Stocks - Scheduled Receipts.

In Which SETTING we specify which stock need to be considerd and which Scheduled receipts need to be considerd .

Is that scope of check OPJJ ???

Please explain

While running MRP AT PLANT LEVEL system not genearting the planned orders FOR A gieven materail

where as if we run MRP at Individual level system generating planned orders

what could be the reason ?

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Answers (4)

Answers (4)

Former Member
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This can be only by exits

sundaresan_velayudam
Active Contributor
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MRP Should not consider the Un-restricted stock of the entire Plant 
 What setting need to done

Use strategy 11 in case of MTS strategy.system will consider the PIR requiremtmt only, system won't consider stock

MRP should not consider the Firmed planned orders for Net requirement calculation 
 What setting need to be done

system will consider the procurement proposal even if it is firm,No setting in config to change this

Finally what is the configuration setting for the net requirement calculation

its std, , you can only define, which stock need to consider during Net requirement calculation (in available stock setting is in OPPQ)

In Which SETTING we specify which stock need to be considered and which Scheduled receipts need to be considerd . Is that scope of check OPJJ ???

OPJJ is for availability check for material not for MRP

While running MRP AT PLANT LEVEL system not generating the planned orders FOR A given material 
where as if we run MRP at Individual level system generating planned orders 

what could be the reason ?{quote}

Run MDAB once, I feel you have activated the MRP after the Material master creation.

Former Member
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Hi All,

Regarding availability check in MRP.

Does the system do availability check while calculating the net requirements or not??

What is the use of Dependent requirement availability setting In MRP plant parameters?

Following are the technical processing steps of the MRP

1. Determines the Net requirements.

2. Identifies the Lot sizing procedure.

3. Identifies the procurement type.

4. Scheduling of the 0 u2013 level product

5. BOM explosion.

Here the question is while determining the Net requirement calculation sty tem has to consider the certain stocks and schedule receipts.

On what basis the system will consider?

I believe the dependent requirements i.e. Net requirements of the dependent products are calculated based on the scope of check setting which we kept in the MRP plant parameters.

Please correct me if I am wrong. If I am correct on what basis the net requirements are calculated for the finish product or Zero level products.

Regarding the SYSTEM CONSIDERATION for Un-restricted status

We can use gross requirement planning for the Finish products, But what about the Dependent requirements, ie Net requirements of the dependent components??

For this MRP AREA is a good answer than the Strategy.

sundaresan_velayudam
Active Contributor
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Regarding availability check in   MRP.
 Does the system do availability check while calculating the net requirements or not??

Both are different concept

What is the use of Dependent requirement availability setting In MRP plant parameters?

While creating a Plan order, system will set the availability check mentioned in Dependent requirement availability for plan order, then only you can able to check availabilty check In MDVM for plan order

for production order Based on OPJK- system will check the availability

system won't consider the availability check concept in MRP

Following are the technical processing steps of the MRP

 1.	Determines the Net requirements.
 2.	Identifies the Lot sizing procedure.
 3.	Identifies the procurement type. 
 4.	Scheduling of the  0 u2013 level product 
 5.	BOM explosion.
 
 Here the question is while determining the Net requirement calculation system has to consider the certain stocks and schedule receipts. 
On what basis the system will consider?

Net reqmt formula = Requirement( PIR/SO) - stock - Procurement proposal ( such as PR/PO/Plan order/prdn order )

Generally system will consider unrestricted stock , and based on configuration available stock in OPPq, system will consider restricted stock, blocked stock

I believe the dependent requirements i.e. Net requirements of the dependent products are calculated based on the scope of check setting which we kept in the MRP plant parameters.

 Please correct me if I am wrong. If I am correct on what basis the net requirements are calculated for the finish product or Zero level products.

System will calculated based on the Net requirement planning, Availability check is different

Regarding the SYSTEM CONSIDERATION for Un-restricted status 
We can use gross requirement planning for the Finish products, But what about the Dependent requirements, ie Net requirements of the dependent components??
For this MRP AREA is a good answer than the Strategy.

MRP area is best option

Former Member
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Hi

thanks for your valuable inputs.

The issue is not yet fully addressed

During Net requirement calculation for the components

we need to consider only Firmed planned orders and SHOULD NOT CONSIDER THE UN-RESTRICTED STOCK

As per your explanation we can make the system to not to consider the UN-RESTRICTED STOCK BY CHOOSING THE STRATEGY 11 OR 20 .

what about the Dependent components.

Net reqmt formula = Requirement( PIR/SO) - stock - Procurement proposal ( such as PR/PO/Plan order/prdn order )

Even for the Finish product also while calculating the net requirement It should not consider the scheduled receipts.

How can we achive this?

Regards

Sasikanth

Edited by: sasiaknth srinivas on Feb 15, 2011 5:41 PM

sundaresan_velayudam
Active Contributor
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what about the Dependent components.

Net reqmt formula = Requirement( PIR/SO) - stock - Procurement proposal ( such as PR/PO/Plan order/prdn order )

if you don't want to consider stock for semi finished also, then maintain all the unrestricted stock in one storage location( &exclude from MRP), system won't consider the stock during MRP

Even for the Finish product also while calculating the net requirement It should not consider the scheduled receipts.

System will consider the scheduled receipts, this is std behavior of SAP

former_member196530
Active Contributor
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Dear

Please note the asnwer of your question :

1.we need to consider only Firmed planned orders and SHOULD NOT CONSIDER THE UN-RESTRICTED STOCK

Any procurement proposal either PR or Planned Order which is Firmed will no longer be considered in MRP for any planning changes unless they are Unfirmed manually .

Secondly , if you are not interested to consider the Unrestricted stock , either you move them into Block stock or move those stock into a Exclusive Storage location which will be excluded from MRP run in OMIR (Maintain 1 -as MRP Indicator )

Even for the Finish product also while calculating the net requirement It should not consider the scheduled receipts.

MRP will consider the schedule reciept as SAP Standard behavior.If you do not want then set block status or set the Delivery Complete .

Regards

JH

Former Member
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Hi all,

The Firmed planned orders are not changed by the MRP. but it will consider while calculating the Net requirement calculation .

The requirement is as below

While calculating the Net requirement It should or it should not consider the Firmed planned orders .

as per the discussion , For this there is no configuration setting in standard.

can we restrict using rescheduling horizon ??.

Can any body explain the Importance of Rescheduling horizon while calculating the net requirement .

Is the system consider only those Planned orders/ production orders/purchase orders which fall in the Reschedule horizon

while calculating the net requirements ??

May be another way is by ABAP User exit / Enhancement points .

Any body who worked on this area , please suggest the Logic. .

Regards

Sasikanth

Edited by: sasiaknth srinivas on Feb 16, 2011 6:37 PM

sundaresan_velayudam
Active Contributor
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can we restrict using rescheduling horizon ??.

Can any body explain the Importance of Rescheduling horizon while calculating the net requirement .

Is the system consider only those Planned orders/ production orders/purchase orders which fall in the Reschedule horizon
while calculating the net requirements ??

Dear,

Rescheduling - system will reschedule the Order , if the order start date in past, Here you can define Rescheduling period, system will take to reschedule, what are all the elements need to consider in rescheduling.

Rescheduling is different, net requirement is different

May be another way is by ABAP User exit / Enhancement points .

I am not aware

former_member335796
Active Contributor
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Hi,

What is the Business requirement for first 2 questions?

>

> While running MRP AT PLANT LEVEL system not genearting the planned orders FOR A gieven materail

> where as if we run MRP at Individual level system generating planned orders

>

> what could be the reason ?

There could be inconsistancies for Planning File entries.

In that case, MRP will be successful at Material Level than at Plant Level.

This inconsistancy will be there till you manually set the Planning file entry for this Material.

After that in the next MRP run, system will take this Material also into account and the there will not be any problm in future.

This generally happens when Mass changes/LSMW for Materials without setting the Planning file entry check box.

Regards,

Siva

Former Member
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For your last question, MRP for plant level considers materials that are there in the planning file with entries. Check whether the material you run existis in planning file and may be run re-generative if there are not X marks for that material.

You have exclude materials in storage location saying these storage locations are planned individually or by creating a separate MRP area for all storage locations you don't want to consider.

As far as I know OPJJ settings are not used for MRP calculation.

cheers

Rav