Follow-up material and open PO

[former_member611794]

Hello everyone,

      When I use follow-up material , I meet a trouble.

      There are 2 materials, Rmat_old and Rmat_new. We hope to use Rmat_new to replace Rmat_old, but Rmat_old has some stocks and also has open PO. So we set Rmat_new as the follow-up material of Rmat_old (in material mast, MRP View 4 => Discontin.ind. = 1, Eff.-out = ‘’, Follow-up mat. = Rmat_new). For example, Rmat_old stock = 100, Rmat_old open PO = 80(delivery date = 20131015). When we have a new dependent requirement 500, we hope MRP suggest us that Rmat_old plan order = 0 and Rmat_new plan order = 320. In fact, in the scene Rmat_new = 400. MRP just consider the stock but no open PO. Then we change Eff.-out = 20131016, this time the result is right: Rmat_new = 320.

      I don’t know why SAP just consider the stock but no open PO, generally speaking, open PO is the fix supply of a company. Maybe I can set the Eff.-out date to avoid excess plan qty. But the fact is that sometimes we will change open PO’s delivery date! If purchasing department just change the PO’s delivery date as 20131115, the MRP result will error! How to deal with it? If we want to consider the open PO of old material , we must enhance MRP program? Where to enhance? Thanks very much.

      Best regards,

      Microfish

[Caetano · Accepted solution]

Hello

Your system is working as designed. Please read the following information provided on note 43636:

9.  Receipts (purchase orders, production orders, QM lots, etc.) after
    the effective-out date are not taken into account for discontinued
    parts.
    Firm receipts after the effective-out date include the exception
    message, "Cancel process".

You should be able to find this exception message on the MRP list (MD05). Also, you should read this note very carefully, as it provides a general explanation of the discontinuation on MRP.

If you want to create your own logic, you can take a look on the following document that I wrote about the available BAdIs on MRP:

http://scn.sap.com/community/erp/manufacturing-pp/blog/2013/08/12/badis-for-mrp

My suggestion for you is to consider BAdI MD_ADD_ELEMENTS or MD_CHANGE_MRP_DATA.

BR

Caetano

[former_member611794 · Accepted solution]

Hi Caetano,

     Thanks so much! Your information is very helpful for me. Your suggestion solution is better than mine, I wanted to enhance the program: LM61XF18,  before the line:

" MOVE mdpsx-mng01 TO mdkp-sum01. " .

     BR

     Microfish

[former_member611794 · Accepted solution]

Hi Caetano,

     Another question about it, someone told me that if we set the Effect-Out-Date before today(for example: 2013/01/01), the system will ignore the date factor and take only the demand and supply factor(include future open PO) into the MRP run. But I don't have the result in my SAP environment.

Does SAP have the logic?

     BR

     Microfish