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How to create a transformation that is different for each mapping going to the same table

Example scenario:

Table DimProject has 2 mappings, each from a different source:

Mapping 1 = SourceA.Project

Mapping 2 = SourceB.Project

Now both systems will have the same project number with different meanings.

 

My question is how do I make a transformation that returns 'A' + [project number] in mapping 1 and 'B' + [project number] in mapping 2.

The solution needs be rely on explicitly meaningful conditions, no implicit conditions that drive people crazy trying to decipher what they are for somewhere in the future.

Any ideas?

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