Problem when validating a sale invoice in CRM-Service module

hazemhazem Member Posts: 187

I have an invoice with 2 lines. Each line is reltive to a period for example: the first line: from 010506 until 310706 and the second line: from 010806 until 311106.
The two lines are for the same contract.

When i'm trying to validate the invoice i got an error.

Can anyone help me please?
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