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                        [14.0][ADD] contract_free_invoice_date
Based on request done by @rousseldenis on PR #839
- [x] added an independent module
 - [x] two minimal tests to prove the functionality
 
@pegonzalezspesol So, we can close #839 ?
@pegonzalezspesol So, we can close #839 ?
sure @rousseldenis