The issue is in AX2012 R2+CU6- the error message received 'The value in field offset account is not valid' when in General journal we use a function 'Select bridged transactions'.
To avoid an error, you can:
1. Check Journal Name setup in General ledger. If you have set fixed offset account, just remove it (the error appears if we have different fixed Offset account in Journal Name and in Method of payment of bridged transaction).
2. Or in GL Journal Name setup form, you can set fixed Offset account the same as in Method of payment (which was used posting bridged transaction- vendor payment).