Opinion on using End routine Vs Field Routine

Hi All,

We need to lookup multiple fields from one DSO and populate in another DSO. To achieve this there can be two approaches, please let me know which approach you prefer and why.

Approach 1:

Code is written in End Routine.

This comprises of a Select to internal table and Loop on Result package to assign the fields.

Approach 2:

Code is written in Start routine and Field routine.

Select to a global internal table in start routine. Read and assign the fields in field routines.

Thanks

AG