Hi,
Thanks for the reply.
Please check the following:
1. Go to OMSR. Click on 'Field Name' (position) button and provide MARC-PRCTR. You will find a selection group assigned to it in the right (e.g. 211). Click on the green arrow to the right.
2. Here you can see the influencing field references and the property of the field accordingly. It may be a case that this setting has been configured at transaction level. So, in your test system, once make the entry 'Opt. Entry' for all the places where it has been entered as 'Required entry'.
Please test accordingly, and consult your MM person. There are many online resources available on material master screen settings. Please search in the SCN MM space also.
Best Regards,
Rajen