Dear Krishna.
If you want to use Bank account - use Posting category "3 Bank posting in payment currency. You can create as many account symbols for banks you need. for example 3.1, 3.2, etc.
system tells you thatn masking works only with acc. symbols that has posting category 3.
"SM34 -> TRACX_ACC_DETER -> Definition of Account Symbols"
As you can see below is 4.1.1 account. It has posting category "4 profit-related".
For your example you can create 2 account symbols: 3.1 for debit. 3.2 for credit. Both assigned to posting category 3.
let's say bank account has the following code. 110010. incoming bank account is 110011, outgoing - 110012.
you have to assign mask to acc sybols like this:
3.1 +++++++++1.
3.2. +++++++++2.
also you have to assign account symbols to your posting schems.
Message was edited by: Grigoriy Babitskiy