BADI not getting called / triggered

Dear Sir,

For using BADI in tcode ME21n / ME22n , I implemented badi ME_PROCESS_PO_CUST for Method "PROCESS_ITEM" . Sir, Even I have kept a break point but its not stoping there.

Subsequently I tried putting break point for other Mehod "POST" also but here also break-point is not getting triggered .

Sir, I doubt that the BADI is not getting called/executed at all .

Pl guide me how to solve the problem .

Regards

B V Mittal