Enable Cross-Tab Mandatory Field Validation for Purchase Order and Change Order Submission

Issue:
Business users are able to submit manually created Purchase Orders, as well as change orders (both manually created and requester-initiated),
without entering required values in the ‘Schedules > Tax Classification’ and ‘Distributions > Requester’ fields, despite these fields
being configured as mandatory using VBCS.

Context:

We encountered a similar issue in the RSSP Shopping Cart, where requesters were able to submit Purchase Requisitions without entering Tax Classification codes. This was resolved by configuring a validation rule and enabling the appropriate page-level properties provided by Oracle.

Option to configure validation: "Configure validation"

Page level properties:
Enable field level conditions in Shopping Cart Business Rules