Mapping Help

Dear XI Experts i do have some mapping problems working on an interface:

pls help me in this issue :

A. I have status field at source if status is:30 or 40 below is the format to map to target field:

"1. Convert ""30"" -> ""Y003M0007""

2. Convert ""40"" -> ""Y003M0009""

3. Ignore the messages other than status 30 and 40"

B.Second one is :

If status is "40", convert and populate this value to KNOTE field, ( Please refer to the SAP points sheet for conversion detail ,this is one small document)

Could u direct me how to convert and populate 'status' value to KNOTE,pls?

Thanks &Regards

Shoukath