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Question

Troubleshooting line items syncing between Fastfield forms and Xero invoices

  • March 20, 2025
  • 5 replies
  • 35 views

Im having issues adding extra line items to an invoice after creation. It works when testing but once the zap is published its keeps adding the subsequent form line items to the invoice I created in testing. Picture below.

 

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5 replies

DavidLGS
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  • Zapier Solution Partner
  • March 20, 2025

While testing did you manually type in an invoice ID (or some other identifier) and forget to switch it over to dynamic for the live zap?


  • Author
  • Beginner
  • March 20, 2025

no I used the static value as below. 

 


DavidLGS
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  • Zapier Solution Partner
  • March 20, 2025

Ah, yes. That’s the same thing as typing in a value. Either way, it’s “fixed”. So every single time the zap runs, it’s going to only update that Invoice.

 

You need to click the 3-dots to the right of the dropdown arrows in the Invoice field and choose “dynamic”.

 

From there, map the invoice ID from Step 2.


  • Author
  • Beginner
  • March 20, 2025

Thanks so much! issue now resolved. Thanks David.


JammerS
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  • Zapier Staff
  • March 21, 2025

Wow! Thank you for confirming that DavidLGS’s resolution got the Zap running. This will significantly help our Community members to have as a reference for the same issue.