I tried to delete a document (transaction type is Journal vouchers), but I couldn't delete a line of journal voucher in the document with error 100 (duplicate value).
How can I delete this line and the document?

Sorry can't assist with the issue, i just wanted to let you know with the first few posts it takes a moderator approval before the post show up in the forum. So be patient and we will get to them as soon as possible.

Are you trying to delete from tfgld102 or tfgld106, check both tables.