Help ! - Goods Receipt Note Document Distribution

GRN document is prepared and countersigned by six people i.e. stores assistant, stores manager, user department representative, user department manager, buyer and purchase manager. The process takes anywhere between 5 - 15 days before it reaches the accounts payable I would like to recommend that the GRN document after being signed by the stores be sent straight to the accounts payable considering the other signatures do not add any value to the process Any suggestions on best practices followed in other companies.