The initial selection screen you get for the transaction VL06O has 8 button options. Requirement is to appear only 4 buttons as soon as the transaction is being called. This can be handled by variants functionality in SAP.
If you set a custom variant (Z), user will see all 8 buttons when he logged in to the transaction code. Then user has to select the relevant Z variant from the variant selection button. A default variant for a transaction code is not possible with custom variants (Z). If you want to apply a default variant for a transaction, you have to save that variant as a system variant.
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Author: Anupa Wijesinghe