Hotel gst bill payment in cash

I am a PSU employee & during my official tour i stayed in a hotel (tariff 1000+132 tax) for 17 days, total bill was of 20944/-

hotel bill was paid 7000 (first advance) then 8000 (second advance on diff date) then on check out date rest 5944/- was paid.

all 03 transaction was made in cash on different dates. my finance has deduct 3040 from my tour claim referring that cash transaction more than 10,000/- is not allowed.

As none of transaction in above case is exceeding Rs 10,000 limit. i would like to know whether deduction of Rs.3040 is as per law or not.