Scheduling Margin Key

[former_member184574]

Hi,

Is scheduling margin key will have effect on scheduling in both Basic scheduling and Lead time scheduling. can any body explain.

[Former Member · Accepted solution]

Dear,

A SMK contains - Opening period, Float before, Float after & Release period

Opening period - Number of workdays subtracted from the order start date to determine the creation date.

Use - The opening period can be used by the MRP controller as an extra time buffer. The opening period is only used in backward scheduling.

Float before - The number of working days between the order start date and the scheduled start date; used as a float in production scheduling.

Float After - The number of working days used as a float for scheduling between the order due date and the scheduled finish date. The safety margin after production is used for compensating malfunctions within the order production.

Release Period - Number of working days in the release period of this order.

Working with an example, lets see how it works:

Given: Need date - 01.01.2011, Inhouse production time - 10 days, Float before production - 5 days, Float after production - 2 days

(assumptions: GR time - 0, Opening Period - 5 days, Release period - 1 days, 7 working days per week & no holidays)

Basic Finish Date - 01.01.2011

Scheduled Finish Date - 30.12.2010 (because Float after prodn is 2 days)

Scheduled Start Date - 28.12.2010 (because Float before production - 5 days)

Scheduled Release Date - 27.12.2010 (because Release period - 1 day)

Basic Start Date - 23.12.2010 (because Inhouse prod time - 10 days)

Opening Date - 18.12.2010 (because Opening period - 5 days)

It will have effect on both the basic and scheduled dates.

Hope it clarifies your query.

Regards,

Alok Tiwari

Edited by: Alok Kumar Tiwari on Jul 21, 2011 6:50 PM

[Former Member · Accepted solution]

@ Alok:

You have done a Ctrl + C & Ctrl + V from the thread -

So how about citing the same instead? In the field of academics the above would be termed as 'plagiarism'

@ KV Kumar 77:

If you use the search feature in this forum before posting your query, you will get a lot of threads which talk about the query you've posted. You're missing out on a lot of valuable info by not searching.

[Former Member · Accepted solution]

@ Alok:

You have done a Ctrl + C & Ctrl + V from the thread -

So how about citing the same instead? In the field of academics the above would be termed as 'plagiarism'

@ KV Kumar 77:

If you use the search feature in this forum before posting your query, you will get a lot of threads which talk about the query you've posted. You're missing out on a lot of valuable info by not searching.

[Former Member · Accepted solution]

@ Alok:

You have done a Ctrl + C & Ctrl + V from the thread -

So how about citing the same instead? In the field of academics the above would be termed as 'plagiarism'

@ KV Kumar 77:

If you use the search feature in this forum before posting your query, you will get a lot of threads which talk about the query you've posted. You're missing out on a lot of valuable info by not searching.

[Former Member · Accepted solution]

@Vivek,

I too observed similar behaviour by MR. Alok on my therads . There should be some copyright protection in SDN:):):)

[Former Member · Accepted solution]

@ Santosh:

There should be some copyright protection in SDN:):):)

I guess you meant that with a pinch of salt. Anyway the idea is that the forum is a place for knowledge enhancement, contribution to the existing knowledge base and not to rehash the same info.

The above is something which I have learnt based on my engagement here & for sure it cannot be done by copyrighting or other external means, but by internal discipline.

[former_member196530]

Dear ,

If you maintain SMK with FBP/Release Period/Opening Period/FAP then it will be considerd to calcualate the Planned Order Start /finish and opening date .

Same will be copied to production order also when you will convert planned order to PO.

But at Production Order level , you have option to change them accodingly and if you hit the scheudle button at top left corener , then it will change the Basic Start/Basic Finish /Schedule start and scheule finsih date .

Check this in your sand box by creatng a sciniaro and test the same.Choose Basic scheduleing indicator in MD02-Scheduling option , maintain SMK at material master MRP2 and perform this test to handson exp.

Regards

JH

[jorsanco]

Exactly it will not only the production order but also the planned order be affected...

[Former Member]

Hi,

In "Basic Scheduling" (MRP)... Scheduling margin key is not considered. It takes the "In house production" days for fixing up the start date. This is only exact to "days".

Lead Time scheduling is carried out on request from the scope of MRP. Target dates are calculated from routing and Capacity requirement calculations are also done. The calculations are exact to the seconds (time).

SCHEDULING MARGIN KEY takes effect only for Lead Time Scheduling. For this you have to configure for "scheduling horizon" to limit the period for which lead time scheduling and capacity planning should be carried out. scheduling horizon is the period in working days. If a planned order has its basic start date within this period in future, lead time scheduling is carried out using the selected routing. The production times are calculated from the float times of the scheduling margin key in the material master record and the time from the individual operations. If the planned order has its basic start date further in the future than this scheduling horizon, the basic dates are calculated from the in-house production times in the material master and are transferred to the production times.

Hope this will clear your doubt.

Regards / US

[Former Member]

Hi,

Along with lead time scheduling SMK also play role in Basic scheduling in determining opening dates / release date of Planned order or purchase req.

Check and Revert,

Santosh

[Former Member]

Hi,

Check this SAP hlep extract:

Calculating Basic Dates Using Backward Scheduling 

Use

For materials that are planned according to the MRP and forecast-based planning procedures, the requirement dates in the future are known. Scheduling is always carried out as backward scheduling. Only if the start date that is calculated in backward scheduling happens to lie in the past, will the system automatically switch to forward scheduling.

Features

In backward scheduling, the order finish date is calculated by subtracting the goods receipt processing time from the requirements date. The order start date is then determined by subtracting the in-house production time from the order finish date.

Finally, the opening period is subtracted from the order start date and the result is the order opening date. 
The opening period represents the time required by the MRP controller to convert the planned orders into purchase requisitions. It is determined in Customizing for MRP per plant as a float.

 

As mentioned for calculating opening dates order floats opening period is considered . This Float is nothing but SMK in custmizing.

Regards,

Santosh Sarda

[Former Member]

Hello,

In the scheduling margin key, you can define float after/before production.

Scheduling margin key will have effect only on Lead time scheduling when adjust basic dates maintained in customizing(OPU3).

[Former Member]

Hi,

As per my knowledge, Scheduling margin key will have effect only on Lead Time Scheduling. For more details please go through following link.

http://www.sap-img.com/production/schedule-margin-key-in-production-scheduling.htm

http://help.sap.com/saphelp_45b/helpdata/en/f4/7d31e644af11d182b40000e829fbfe/frameset.htm

Regards,

Hiren

[mashfaq]

Dear,

scheduling margin key will affect both scheduling if scheduling parameter is set adjust basic dates, adjust dependent requirement to operation date in adjust scheduling.

Thanks

Muhammad Ashfaq