Field catalog issue using REUSE_ALV_FIELDCATALOG_MERGE

Question

Hello experts,
I am using FM REUSE_ALV_FIELDCATALOG_MERGE and the field catalog is created fron the program.
The field catalog finds the date field from the program but my internal table has been changed to make the date output YYYY/MM/DD.
When I input the internal table in FM REUSE_ALV_GRID_DISPLAY the output displays the date as DD/MM/YYYY which is not what I want.
How can I get FM REAUSE_ALV_GRID_DISPLAY to output the date in the format YYYY/MM/DD which is in my input table.
I have spent a lot of time researching SDN on this but cannot find a similar solution however I did find some examples of changing the field catalogue. Can anybody suggest this is the way to go and if I would use the edit mask field in the field catalog or is there a better way.
Thanks for any suggestions

Answer 1

I think you can use a field exit for this.
This means creating a field element and a domain in the data dictionary, the domain will need to have a conversion exit set by putting an entry in the 'Convers. Routine' field, eg MYDAT.
You will need to create two function mdules as below:
eg, CONVERSION_EXIT_MYDAT_OUTPUT
and CONVERSION_EXIT_MYDAT_INPUT
Your internal table will now need to refer to the data element you have created instead of the one you are currently using. ALV should automatically pick up the conversion exits and show the ouitput as you desire.
FUNCTION CONVERSION_EXIT_MYDAT_OUTPUT.
""Local Interface:
*"  IMPORTING
*"     REFERENCE(INPUT) TYPE  DATS
*"  EXPORTING
*"     REFERENCE(OUTPUT)
concatenate input(4) '/' input4(2) '/' input6
into output.
ENDFUNCTION.
FUNCTION CONVERSION_EXIT_MYDAT_INPUT.
""Local Interface:
*"  IMPORTING
*"     REFERENCE(INPUT)
*"  EXPORTING
*"     REFERENCE(OUTPUT) TYPE  DATS
data l_string type string.
l_string = input.
replace all occurrences of '/' in l_string with ' '.
output = l_string.
ENDFUNCTION.