I am assuming that this line was manually entered. Sometimes I think it is better to use the following option instead if manually entering the details.
Then you can check that you have quantity left to be returned.
So the sales return order looks like the below.
Is this something that you could try to see if it helps with the error?
There is only one line item in Sales return order page and while posting the sales return order the below screenshot error is throwing. Please find below two screenshots for your reference.
Are you able to post a screenshot of the sales return lines? I would particularly like to see the Qty on each of the lines.
Thanks,
Shauna
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