Limit string-length in Reporting Data Source

Hello,

we want to report some attributes to the BI. For this we use the standard reporting activity in the BPM. After we done a lot of configuration on the CE and the BI we achieved to connect the two systems. All attributes are passed correctly to the BI and now we have a problem with the string-length we pass to the BI. The string-length they get from the CE is 512 but the BI can only handle strings with a 60-length. Is it possible to limit the length of a string in the BPM or the CE?

Manuel