Showing results for 
Search instead for 
Did you mean: 

Subitem Generation is not happening in Location/Product Substitution


Hi Collegue,

Currently we are facing an issue in Alternative Based Confirmation functionality of aATP, where we choose option for “Substitution Item Type”= Force Subitem Generation, aATP doesn’t work at all and even the subitem doesn’t generate.


This issue is for both substitution method such as Plant & Product Substitution.

As we are aware there is something related to below Item Category Determination, where TAPA is supposed to be Main Item and TAN is supposed to be Sub Item.



But unfortunately, it’s not working as expected, Moreover I was wondering, about the above Item Category Usage, is there is some other customization which we are missing, because we followed every steps from SAPhelp and didn’t found any setting related to Item Category Usage.

Ex:- Below is the example, where Material TG11 doesn’t have stock in plant 1090, and we have selected substitution method Force Subitem Generation. We have created the Plant Substitution as per below, if there is stock shortage in Plant 1090, it should automatically substitute to Plant 1010.



But Unfortunately nothing happens, even ATP check doesn’t occurs.




Requesting SAP Pioneers to please help and let us know, how to achieve the Product/Location Substitution with Sub Item Generation.

Referred Additional blog highlighted below:-


Note:- We are using new release system of SAP S/4 2022/2023 and it’s not working in both the systems.

@n_k_m @Andreas_Krause @Mrinal_K_Roy 



View Entire Topic
0 Kudos

Hi Abhishek_Suman11,

The issue sounds like a configuration and/or restriction issue. There are some restrictions existing which preventing the ABC execution or of course some required configurations are needed to enable the ABC execution.

Please check my FAQ KBA about ABC: 2776851 FAQ: Alternative based Confirmation (ABC) with aATP -> Question  - where I have listed some restrictions and a configuration check list - to help you solving the most common problems with ABC. 

Otherwise please consider to create an SAP support ticket if you can not resolve the problem with the help of the KBA.

best regards,


0 Kudos
Thanks a lot @michael_thinschmidt, it's working now, but there is one major problem that, even though when we have stock, then also ABC functionality is getting applied and subitems are getting generated. We have selected the Substitution Item Type as " Allow Inline Substitution and Subitem Generation "
0 Kudos
Hi, sorry...without checking an example I cant tell you the reason may create a new case at SAP support and I can have a look...