Thank you for your post.
I see that the key field for one of the table is the concatenation of year and week number. Is this between AP_Batch and AP_Invoices? If your names are not showing in the AP_Batch portal, then place the key field between AP_Batch and Vendors on the layout and find one of the records where the Vendor name is blank. Copy the key field, switch to the Vendor table, enter Find mode, paste the key information into the field and press return to Find. Do any records appear. If not, then view the key field in the Vendor table. Does this give you a clue?