Change addenda record in ACH Payment File

Question

My requirement is to change the addenda records in th line item records starting with 7, which are generated after running ACH payment , i need to place some data instead of the original one starting at the position of 4th till 80 chars in length.
705ISA00NV 00NV ZZNV ZZNV 09100615300010000001
to be replced with few fields as per customer requirement at the underlined positions
705_ISA00NV 00NV ZZNV ZZNV 09100615300010000001_
I figured out that the Function modules being used are FI_PAYMEDIUM_ACH_30 and FI_PAYMEDIUM_ACH_40 dealing with these line items.
My question is to replace some chars in the line item i have coded by copying the standard to ZFM so is it sufficeint to replace the respective standard with z function modules or do i need ot create a new copy standard ACH format to ZACH and replace all the five event funciton modules to z function modules. If somebody worked in this area, please extend your help regarding the same.
Regards,
Vivek

Answer 1

Hi Ravi Kumar,
Please do inform how did u come to a solution as i'm also looking at the same scenarion and some input is appreciated.
My requirement is to change the addenda records at everyline item, as u have put the line items startign with 7, i need to place some data instead of the original one starting at the position of 4th till 80 chars in length.
705ISA00NV 00NV ZZNV ZZNV 09100615300010000001
to be replced with few fields as per customer requirement at the underlined positions
705_ISA00NV 00NV ZZNV ZZNV 09100615300010000001_
I figured out that the Function modules being used are FI_PAYMEDIUM_ACH_30 and FI_PAYMEDIUM_ACH_40 dealing with these line items, is it sufficeint to replace with z function modules are do i need ot copy all the five event funciton modules.
Regards,
Vivek