Mapping Input Parameter renders mapping unable to be compiled or deployed

Hi there. I have an interesting issue I have not encountered before.
I can create a new mapping with a Mapping Input Parameter (just one parameter of type Integer), map this to a table column of the same type and the mapping compiles and deploys without any issues.
However, if I take an existing mapping (which already compiles and deploys without issues), add a Mapping Input Parameter to it (just one parameter of type Integer) and map this parameter through to a table column of the same type, when I compile the mapping I get a pop-up "Warehouse Builder Error" with a number 56 and a red cross. The mapping cannot generate any code and gives no explaination. Trying this on a different mapping causes the same issue but with a different number in the pop-up.
I have tried changing the parameter from integer to another data type and this makes no difference.
Removing the Mapping Input Parameter makes the mapping compilable and deployable again.
Am I missing something here ?
Thanks
Paul

Ok... this could be a bug, but I worked out how to resolve the issue.
To get the issue:-
1. Open a mapping which does not have a Mapping Input Parameter and compiles and deploys happily
2. Add a Mapping Input Parameter object, add an output attribute to it and map it to a table column.
3. Compile the mapping and you get a "Warehouse Builder Error" pop-up with a number, then a Validation Completed Successfully message. But no code can be generated and the mapping
cannot be deployed.
4. Slap your forehead and say "Doh!"
To fix the issue :-
1. Open the same mapping
2. Resynch the tables you mapped the Mapping Input Parameter to. The mapping now compiles and deploys ok.
3. Pat yourself on the back
cheers
Paul

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