Your agency must notify you as soon as practicable after you submit your travel claim of any error that would prevent payment within 30 calendar days after submission and must provide the reason(s) why your travel claim is not proper. However, not later than May 1, 2002, agencies must achieve a maximum time period of seven working days for notifying you that your travel claim is not proper.
41 C.F.R. §301-52.18