Section 85. Appropriation Before Entering into Contract. —

1. No contract involving the expenditure of public funds shall be entered into unless there is an appropriation therefor, the unexpended balance of which, free of other obligations, is sufficient to cover the proposed expenditure.

2. Notwithstanding this provision, contracts for the procurement of supplies and materials to be carried in stock may be entered into under regulations of the Commission provided that when issued, the supplies and materials shall be charged to the proper appropriation account.