F110 issue?

Dear All

Indian Client Requirement:

• Company Code Currency =  INR
• House Banks  = 100 with different A/C ID's
• Payment Method for all House Banks = C
• Different GL A/C's for all 100 Banks

I mapped all this 100 House Banks in FBZP ------ Bank Determination------Ranking Order

Pay Method             Currency        Ranking Order      House Banks

C                         INR                         1                    1000

C                         INR                         2                    2000

C                         INR                         3                    3000

C                         INR                         4                    4000

• Now, While doing Automatic Payment for House Bank 4000, System is picking 1st ranking order i.e, 1000.
• I maintained Payment method in Vendor master/Vendor Invoice as C.
• I maintained all the above Bank A/C's in Vendor Master.

Can anybody suggest me. Why system is picking 1st ranking order 1000, If Iam giving 4000 in F110.  I need system to pick any House Bank from ranking order.

Anil