We configured a ext transaction type for HSBC bank , number 840 as shown below
840 - 1005
where, 1005 is the posting rule .
when the bank file is executed it will posts as follows
DR 1901007200 (bank balance ) CR 1901007221( hsbc incoming ).
the business is saying that the positngs are correct but the sign ( - ) is wrong, if I change it to + then it gives