Invalid Ship To message on Drop Shipment Entry

Epicor ERP 10
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1

Drop shipment entry is giving a “invalid ship to” error;

Sales order is correct for ship to address;
does the PO need to also have the customer on the ship-to on the header tab of PO entry?

2

Is the Drop Shipment screen showing the correct customer number in the Ship To area? The PO should have the Ship To customer number on the Releases > Drop Ship Address tab not the Header tab. Whatever is listed on the Releases > Drop Ship Address should have the same address as what is on the Header tab for Ship To Name, Address, etc.