Stored Procedure for Batch Number Format and Block Duplicate Batch Number

Hi Experts !

I am new one in forum asking question.. I want Stored procedure for Batch Number Format. I want fix one Batch number format in Stored Procedure.

Example :

My Batch number format Like  BATCH00001 - It should be first five digit is text format and next five is Numeric.

IF create Goods receipt PO or Goods receipt stage I create batch number like BATCH 00001 or any other number means don't add that document and also duplicated batch number also does not allowed. please give me the solutions. I am sorry for my bad english .