Project Expense Reimbursements on H1-B

[gc_meds]

I am right now on an all Expenses paid project with company A. There are multiple layers involved in this equation with my company (Company C) at the bottom of the rung. By the time the Expense reimbursement checks make it to me from Company A to Company B to Company C, it's about 4-5 months. In an effort to offset these delays, Company A has expressed an interest to reimburse me directly for my expenses.

My concern is that - by accepting any payment from Company A (though not for Services), would I be in any violation of my H1-B terms?

Thanks