The contractor (or leader in the case of a joint tender) must send an invoice in electronic format, unless requested in paper, for the interim payment as provided for in the tender specifications, accompanied by the following: 

 a list of all pre-existing rights  to the results  or parts of the results  or a declaration stating that there are no such pre-existing rights , as provided for in Article II.13.4; 

 a relevant technical report or deliverable result or reference to tender specifications or specific contract; 

 statements of travel expenses in accordance with Article I.5.3. 

2. The contracting authority must approve any submitted documents or deliverables and pay within 30 days from receipt of the invoice. 

3. If the contracting authority has observations to make, it must send them to the contractor (or leader in the case of a joint tender) and suspend the time limit for payment in accordance with Article II.21.7. The contractor (or leader in case of a joint tender) has 10 [ten] working days to submit additional information or corrections or a new version of the documents if the contracting authority requires it. 

4. The contracting authority must give its approval and pay within the remainder of the time-limit indicated in point (2.) unless it rejects partially or fully the submitted documents or deliverables. 

## I.6.3. Payment of the balance 

1. The contractor (or leader in the case of a joint tender) may claim the payment of the balance in accordance with Article II.21.6. 

The contractor (or leader in the case of a joint tender) must send an invoice in electronic format, unless requested in paper, for payment of the balance due under a specific contract, as provided for in the tender specifications and accompanied by the following: 

 a list of all pre-existing rights  to the results  or parts of the results  or a declaration stating that there are no such pre-existing rights , as provided for in Article II.13.4; 

 a relevant final technical report or deliverable or reference to tender specifications or specific contract; 

 statements of travel expenses in accordance with Article I.5.3. 

2. The contracting authority must approve the submitted documents or deliverables and pay within 30 days from receipt of the invoice. 

3. If the contracting authority has observations to make, it must send them to the contractor (or leader in the case of a joint tender) and suspend the time limit for payment in accordance with Article II.21.7. 

The contractor (or leader in the case of a joint tender) has 10 [ten] working days to submit additional information or corrections or a new version of the documents if the contracting authority requires it. 

4. The contracting authority must give its approval and pay within the remainder of the time-limit indicated in point (2.) unless it rejects partially or fully the submitted documents or deliverables. 

