Profit Center Business Unit Not Derived at Sales Order Line Level

We have encountered an issue where a sales order was successfully created and submitted; however, the Profit Center Business Unit is not getting populated at the sales order line level. The order header information is available, but the Profit Center BU field remains blank for one or more lines.

We have verified the item, customer, and business unit setup, but the expected Profit Center BU derivation is still not occurring. Could anyone please advise what configurations, mapping sets, account rules, or line-level attributes should be checked to identify the root cause?

Has anyone faced a similar issue in Oracle Fusion Order Management and found a resolution? Any guidance on troubleshooting steps or relevant setups would be greatly appreciated. Thank you.