FB50 (Enter G/L a/c Doc) Transaction Help - Urgent

Hi all,

Can anyone tell me how would I be able to change the document type that is defaulted in the header meaning as of now it is defaulting 'SA' which I would like to change to a user defined document type that we are using for manual JV's and I have a validation rule that checks the document type being used. Since, it defauting 'SA' the user has to physically change the doc type to 'XX' everytime he/she uses FB50 to post a manual Journal entry

So, Please tell me how would I change the default doc type to the user-defined doc type in the header screen of FB50 transaction

Your help is highly appreciated

Thank you,

Manoj