Greyed out DFF based on Requisition line category name

Hi Team,

We have a client requirement where we have created two DFFs at the line level (e.g., DFF1 and DFF2). Based on the selected category, one of the DFFs should be disabled (greyed out). For example:

• If the requester selects Category 1, DFF1 should be enabled with available values, and DFF2 should be greyed out.
• If the requester selects Category 2, DFF2 should be enabled for selection, and DFF1 should be greyed out.

Is this functionality possible? If yes, could you please advise on how to achieve this?

Appreciate your quick response.