EXPERT RESPONSE
There are many ways to achieve this goal. For one, there are the filters in the SALE configuration where you can define simple mappings and value transformations -- a bit complicated to set up but they do the job.
I normally prefer doing the remapping in the code. If it is as simple as you describe you may decide to use one of the user exits of the inbound IDoc function to code the desired mapping.
If you have to do more complicated mappings, I suggest to build a wrapper function for the IDOC_INVOIC_INVOIC_xx that does first the transformation and then calls the original function.
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