Restrict material groups at PR/PO creation for items w/o material master

Dear SAP experts
I have one question related to restricting material groups which are possible for selection during purchase requisition or purchase order creation.
The material group is created and several material master records are linked to it. Now the requirement is that when users are creating either purchase requisitions or purchase orders it shouldn't be possible to select that specific material group>
But this should be valid only if PR or PO are being created for items without material master record. If PR/PO is created for item with material master record then the restriction should not take place.
What would be the nicest solution to achieve that?
Thank you all in advance for your help.
Regards,
Miha

Hello Prakash
Thank you very much for your answer. i think it is a very good starting point.
However I am not too familiar with authorization group configuration of material groups.
Right now in our system (transaction OMSF) field authorization group is empty for all existing material groups.
Does this mean that for the material group that I want to have restricted I need to have two entries: one with Authorization group ZOK and another with ZNOTOK (or whatever the naming would be)?
Furthermore I would like to ask you where is then the link between authorization group and user exit?
And thirdly: do you perhaps have some more details which user exit(s) are relevant for our topic?
So far thank you very much and I hope that you can provide me also with additional info.
Rgds
Miha

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and what it controls???

Hi,
In this step, you can assign a purchasing value key and a valuation class to a material group.
The assignment of a purchasing value key provides you with default values for reminder levels etc. in purchase order items without a material master record and without an info record.
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TR creation for items with no available stock

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Hi Thyagarajan,
I wud like to share with you a content of SAP documentation which is as follows:
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Hello Friends,
My client has a new requirement as below:-
I have material groups : 0001, 0002 and 0003
For Material Group 0001 : Only Vendors A, B & C are allowed.
For Material Group 0002 : Only Vendors B, C & D are allowed.
For Material Group 0003 : Only Vendors A, C & D are allowed.
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Friends,
I am closing this thread since I could find an answer myself the same is shared below hoping that the same will be useful for atleast few..
1) Create the Info record with material group without price (Make price non- mandatory in the config.)
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Dear Expertsl,
I developed a search help exit for material group for the search helps both H_T023 and H_2023_MEPO to restrict certain material groups from the actual display as follows
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link:[https://wiki.sdn.sap.com/wiki/display/Snippets/CaseInsensitiveSearchHelpExitforMaterial+Group]
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LOOP AT a_tab.
only move values that meet the requirements
after you convert to upper case.
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This is working fine when we press F4 in ME21N Transaction and give some description and then press enter the popup screen.
But my requirement is user will enter some description in ME21N material group field and press enter ( Not pressing the F4 here) at this moment this is not going through the search help exit and displaying all the entries including the Invalid materials.
Note: We can delete the Invalid material groups but the documents which are having the invalid material already will have an issue and need to be corrected all the documents. But our requirement is only to use the correct materials groups from now onwards.
I would appropriate if any one can helping this regard.
Thanks in advance.,
Regards,
Venkat

Hi Venkat,
You can call your ZSEARCH_HELP from the PAI , on the event SY-UCOMM = Enter using the function module F4IF_FIELD_VALUE_REQUEST.
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CALL FUNCTION 'F4IF_FIELD_VALUE_REQUEST'
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      tabname                   = 'MARA'
      fieldname                  = 'ZXXXX'
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      dynpnr                      = '0100'
      dynprofield                = 'MARA-ZXXXX'
TABLES
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Regards
Deepa.

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Thanks... Gopinath

Hi,
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For respective material group you can assign the correct valuation class.
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Material group for services

Hello to everyone,
does anybody know why it is necessary to fill up the material group field at item level when you create a purchase requisition for services with item category "D". Because when you create a purchase requisition for services, you include services items with their own services group, then I don't know why it is necessary to include the material group, too.
Kind Regards.

Dear Ignaciohsg,
Please kindly check if your customizing have set this field as optional or required.
SPRO:MM-PUR-PR-Define screen layout for PR.
The issue might be that the 'Material Group' is a required entry at item
level, as per your customizing .
Field selection key PT9F -> Basic data, item.
Best Regards,
Ian Wong

G/L for Material Group

Hi All,
I have a requirement for assigning Valuation Classes against Materials Groups. I can do this in IMG in Materials Management>>Purchasing>>Materials Managmement>>Entry Aids for Items without a Material Master.
Now we also have assets being procured through POs.The system requires a Material Group when creating a PO for an Asset.
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Now if I create a PO for ASASCLS01 and enter the material group MG01 then which G/L shall get preference in the automatic a/c determination during postings ? X or Y

x will be assigned u can c directen in account assignment tabe at item level

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regards

Arif ,
If I have selected a account assignment ,(for eg 'A') , in PR , then whether I can restrict the materiaL Groups , in such a way that , material groups which should be used for Asset only can be selected in PR ?
Suppose I am having material groups A1, A2, A3, for asset .
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Then suppose if I am creating a PR with account assignment 'A' , then only I should be able to select A1 or A2 or A3 .
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>
Monique Stephens wrote:
> Training is not the issue. Material groups are a matter of personal preference.
>
> My main concern is if it would be a violation of SOX if the material group is changed from the original shopping cart on the PO itself.
>
>
> Monique
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Restrict material groups at PR/PO creation for items w/o material master

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