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Help with linking schematic to PCB symbol, pin assignment

ML202512236951

I'm working with a custom defined ball grid array (BGA).  I have created the PCB footprint with Presto, a grid of 18 x 18 pads.  Then I created the schematic symbol, and specified pins using the spreadsheet option.  Pins are labeled as A1, A2...D1,D2, etc. When I attempt to place the PCB footprint, I can see that the nets exist.  When I try to actually place it on the PCB and compete the operation, I get an error message that says: "(SPMHGE-82): Pin numbers do not match between symbol and component. Run dev_check on device file for more information."

In the screenshot example I have to two pins wired to the BGA.

Any insight would be great, thank you.

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