Wrong sign in COPA for rebate conditions

Hi financial gurus,

i'm getting problems once trying to send in copa values related to Rebate conditions.

To be more exact i mapped the rebate condition type with a COPA value field and once issuing an invoice data are retrieved and sent to a COPA document: the problem is that the value is with sign minus ➖ and as far as i read from oss it's not correct. workaround directly in reporting is not possible since these value fileds are also feeded by excel file and copa condition records.

Could me help on that

Any useful help will be largely awarded

Regards

Carmine