Hi Jain,
As regards Partner Type = B, I can see 2 things that you could change. 1: All PAYEXT, EUREXR and FINSTA are not with message variant or message function. 2. Use the later version of message type = PEXR2002 for PAYEXT.
When it comes to logical system (partner type = LS) for IHC ALE setting, you would have 2 (one for Loopback and another for your logical system). The best way is to follow W25 BB configuration document.
Kind regards
Taro