Editing the standard SWCV provided by SAP

Dear all,

i have configured end to end scenario (proxy-soap) ECC HCM-PI-SuccessFactors  using the standard ESR

content(SWCV : SFIHCM01) provided by SAP. Now i have a requirement to validate a incoming field and raise a

exception as per discussion How to raise a exception if the incoming value for a source field is empty

To do the custom requirement and validate a field using UDF

1) Should i edit the mapping logic in standard SWC componet or should i develop a new custom object

(product, swcv, creating dependencies, ESR design obects and ID config objects)

Note: Standard objects can be modified by selecting the object properties like Language : English &

Checking the checkbox : Objects are modifiable

2) Is it advisable to change/modify the standard content

Please provide your valuable inputs

Regards

Koti Reddy