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The field unit must be a string with a minimum length of 3 and a maximum length of 8.

Cause

This error occurs when the Unit Quantity Code (UQC) is not updated in the Unit master.

Resolution

1. Press Alt+G (Go To) > Alter Master > Unit.
2. Select the name of the Unit for which the invoice is recorded, and press Enter.
3. Update the Unit Quantity Code (UQC) and save.

Now, generate the e-Invoice again.