Hi Antonette,
In SAP BW /SAP ERP for character (CHAR) type info objects allows maximum
250 chars only .
For reference see the below screenshots.
1.In SAP BW 7.0 char objects
2.SAP BW 7.3/7.4 allows maximum 250 chars.
Are you required such big length character info object. if not then reduce the length of the fields then activate the data source.
Regards
Surendra