invoice conversion duplicate issue

Summary:

Unable to perform conversions, There are few transactions in the fbdi file, where 2 lines for one credit memo one line is negative amount and another line is positive amount, and grand total credit amount is in negative amount only and the Line transaction flex field is also unique for each line. still not able to load the invoice.

for one line error is : Duplicate invoice and another line error is :The document created must have a negative amount total, because the creation sign of the transaction type is Negative. the transaction type is credit memo

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