Implement Unit Price Validation for Specific Natural Accounts in AP/Procurement

Summary:
Hi All,

We need to implement a validation rule in Accounts Payable and Procurement that prevents submission or posting of a transaction when the unit price exceeds $9,999.99 for specific natural accounts.

Validation Logic: If the line item’s natural account is one of the requirements and the unit price > $9,999.99, then:
* Prevent submission of the transaction
* Display error message

Has anyone implemented something similar in Oracle Fusion Cloud? We’d appreciate guidance on where and how to configure this—e.g., using approval rules, custom validations, or forms personalization.

We’ve explored Page Composer but couldn’t determine how or where to apply the logic for the unit price field.