Validation and F4 values for fileds manufacturer i...
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Did you already check user-exit (EXIT_SAPMIEQ0_002 / IEQM0007) aka : Customer-Defined Check/Change in Manufacturer Data for Technical Object
For search help
it does not appear that SAP has provided any suitable option, you may need to apply modifications to the standard dynpro (explicit on value request) or the ddic elements behind the fields (check table/foreign relation to trigger search help).