Use Transaction Variants to make fields Mandatory, Hidden or Display. Also applicable to screens and tabstrips.
You can hide unwanted screens and fields in any of the standard SAP programs without changing any of the standard programs. Additional features such as making the variant as default on the standard SAP transaction code is only available as of 4.6x.
Transaction SHD0 - Create a variant for the required transaction by changing the layout through hiding fields and screens.
Transaction SE93 - Create a variant transaction (e.g. for VA02 = ZVA02).
Next allocate the transaction variant to this variant transaction.
In 4.6c, you can default your transaction variant as the standard variant. (SHD0 - Edit -> Activate/Deactivate as standard variant)
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