Any hints on how to go from Requirement to Transformation Code?

Hi Experts,
I am trying to upgrade my skills in Transformation and reading some books on Transformations logic and I am getting lost. But when you bring in your practical guide it helps make it clear and I will appreciate some hints based your experience.
1. Do you have any specific transformation requirement (from source to target) to share with me? And I will appreciate an explanation of the transformation requirement and transformation logic
2. Is there a specific approach to converting the requirement to code? can you use a real-life case to explain it?
3. Are there any best practices in converting requirements into codes?
4. Is there a best practice for testing and validation of the transformation code?
5. Any Dos and Don'ts in converting requirements into transformation logic?
Thanks
Edited by: AmandaBaah on Nov 9, 2011 8:55 PM

Hi Amanda,
I think you should start with the type of routines you can write
start routine
Field level Routine
End Routine .
Expert Routine
There are lots of SDN articles available for the same .In forum you will find various scenarios and requirements comes in projects.
1.Start and End Routine works on package so you need knowledge of tables ,loops ,structures etc to write the code .
They are good when you want to update multiple fields and want to implement complex logic.
2.Field level routine works as one record at a time so its good when you want to do lookup etc for one field only .
3.There are specific scenario when you can use a specific routine and it also depend greatly on your business requirement ,efficiency and performance of code ,your comfort level .
ex: Write start routine if
you want processing of multiple fields at source data without filtering .
You want to implement some logic based on which you need to update some more records at field level or at end routine . * You want to delete unwanted records.
You are doing master data lookup at field level routine so selecting master data in an internal table should be done at start routine.
Write field routine if
Only one field need to be update and logic is simple .
You want to change record by record.
You have lookup .
You want to further implement some logic at end routine based on changes done at field level routine
Write End routine if
It is final logic that you want to implement .
You have multiple fields to update
start routine and end routine can be used vice verse .Use them based on your requirement and efficiency of code.
4.These threads will be helpful for you :
Scenario examples for Lookup
Re: What is the use of Look Ups?
Sample Routine Code
Re: Start routine - how to....?
Re: Routine
ABAP in BW
Re: Abap for BW
Hope this will be helpful .
Regards,
Jaya Tiwari

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