Check your import file. I've run into this bug. It seems an import will fail for P12 if there is no delimiter after the 12 month, so if it's the last column that could be your issue. I opened my file in excel and put a single quote in column 18 and now the file saves with a delimiter after the last column and the import is successful. I was also able to move another dimension to the last column instead of it being DEC/P12 and that also eliminated the issue in case you have something that creates the flat file and can simply be reordered.
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