Input VAT Recovery Timeline- PDC issued/ Partially Paid

As per clarification,consideration need to pay within 6 months from due date. In case, we claim VAT and issued 4 equally PDC payment quarterly basis Or partially paid and balance 9 month PDC. Or partially released payment and assumed tax amount paid before expiry of 6 months.

Such other payment issues are there like back to back agreements . In all such cases,should still need to reverse VAT amount or assumed VAT amount is paid fully in first/initially payments and both parties are agree for new extended dates as well for the payment of consideration.

Still required reveral of Input recovered?