Change on Lookup

Hi dears,

I need to change the prompt to the user on the Process Requisition screen, that on "Process Requisition"

• Search for the approval PRs.
• Then select one line or more lines.
• Then click on 'Add to Document Builder'.
• The system opens a new screen to select the type first in this list we have some value (New Order - Existing Order - New Negotiation).

Who I can edit the value prompt in this list? I try to edit it by Sandbox but I can't.

Thanks,