Error 18 in the Update

I am attempting to load text from R/3 into an infoobject, and then into an infocube. The text from R/3 has forbidden characters (i.e. # and tabs). I have tried adding the forbidden characters in RSKC, and I have tried entering ALL_CAPITAL in RSKC. I have also tried flagging the infoobject for lowercase letters. None of the above have been successful.

From the research I've done, it seems the only solution is to write ABAP code in the update rules going into the infocube. However, our system is a unicode system. Any type of code examples that I've found have been for non-unicode systems.

My question is, what is the best solution for a unicode system? Also, changing the source data in R/3 is not an option. Thank you in advance for any suggestions.