Field help (NEXINVAMT2) 

This field displays the excluding-tax amount of the next invoice provided that the contract has not yet been revaluated, or revaluated using the post-revaluation method.

For a pre-revaluated contract, this field displays the amount of the first scheduled invoice only. The amounts of next invoices are not known.

This amount is calculated based on the annual renewal and following parameters:

It is calculated automatically when creating the contract in order entry. It is recalculated automatically each time an invoice is generated for the contract.