Hi,
Option 1: Create Two Different document types for PO: Say ZNB and ZCON.
- Create a new field selection key (say ZNB ) for PO doc type and maintain the material short text as display only. Assign the field ref key to the document type ZNB. Now, whenever the user select the document type ZNB, he can only enter the material code and he cant change the short text.
- Create another field selection key (say ZCO) for PO doc type and maintain the material number field as display only. Assign the field ref key to the document type ZCON. Now, whenever the user select the document type ZCON, he can only enter the material short text and he cant enter the material code.
- The above option will work perfectly in ME51N. But the in change mode, you have to use only one field selection key.
Option 2: Go for development using the BAdI :ME_PROCESS_REQ_CUST and write the logic in such a way that when the field MATNR is not blank, maintain the material short text field as display only.
Regards,
AKPT