Chinthan,
As described in my comment above, please note that I believe the following screen override entries need to be added to the OSS Note (and likewise for VA02 and VA03):
VA01 | SAPMV45A | 4001 | 9099 | SAPMV999 | Overview - All Tabs except Sales | |
VA01 | SAPMV45A | 4008 | 9099 | SAPMV999 | Overview - Sales Tab |
I had to add VA01 entries to combine screens 4001 and 4008 of program SAPMV45A. These are the Overview screens (not header or items).
Rob