Receipt Number not shown in create invoice--Select and Add Purchase Orders UI

Summary

Need the receipt number field while adding lines in the invoice

Content

Our customer is implementing supplier portal. They want the receipt no field in the create invoice-- select and add purchase order screen (Creating a PO matched invoice).

While trying to create invoices in supplier portal against a PO, the suppliers can see the PO Number,Line No, Schedule No but they don't see the Receipt No. Without the Receipt No, the suppliers will not be able to select the right lines against which they will like to create invoices. The receipt no field is there when the payables supervisor is entering a PO Matched invoice; same has to be made available in supplier portal also. When receipt no and the details are already available in other screens in supplier portal, why the same is not provided in the