Is it possible to skip AP invoice checking for direct items related work orders closing

Hi,

Could some one suggest on below query.

In one of our client environment, work orders direct item process is using for vehicle registration charges ( petty cash ), equipment certification charges etc to distribute the charges to each asset (Asset wise WIP Accounting classes also maintaining). Actually they will pay these amounts over a period of time, instead of each asset / work order wise.

But while closing the work orders, system is checking for AP Invoice line related to the direct item. How to avoid this checking for closing the work orders related to direct / OSP items ?

Note: The volume of work orders is also high.