(ABAP) Code in Transformation--Please explain

Question

I am getting a strange issue when used the below code
Target : Charasteristic,Data Type CHAR 5
Code:
DATA: years TYPE tfmatage,
months TYPE tfmatage.
*DATA: result TYPE c LENGTH 5.(Showing error if included:Result is already declared)
DATA: l_res TYPE p DECIMALS 2.
IF source-field-/bic/zdob IS INITIAL.
result = ''.
ELSE.
CALL FUNCTION 'FIMA_DAYS_AND_MONTHS_AND_YEARS'
EXPORTING
i_date_from = source-field-/bic/zdob
i_date_to = sy-datum
i_flg_separate = 'X'
IMPORTING
e_months = months
e_years = years.
if months 0.
l_res = years + months / 100.
WRITE l_res TO RESULT.
else.
write years to RESULT.
ENDIF.
ENDIF.
WRITE / RESULT.
I am using the above code (given by Mat in SDN) as a field routine in Transformations...can any one please explain me in detail(step by step) whats it doing.
My requirment is to cal age of the employee in YY:MM format based on his DOB & SY datum.
FIMA_DAYS_AND_MONTHS_AND_YEARS give Years & Months between 2 dates
Please update me where i was doing wrong
If months = 0 the the result should be only years
Ex: if Months & Years of FM Output is 40Y,0M the i want only 40 to be updated insted of 40.00 so that the reason why i enhanced your code
But it is giving me strange output
For Output which got months it is being update correctly but
for output for which months are 0 it is being update as
If FM output is 40Y,0M
then the output being updated is ' 40' (2 spaces before 40)
In report i need to enter 2 spaces before 40 to retrive values of 40
Please correct error
Please ask if you need any info
Thanks

Answer 1

Hi,
Are you using transformations?
You should not use Result because Result field is a part of SAP generated code.
Exclude declaration of result and check the code.