Cannot Load Master Data Text for 0MATERIAL in BI .7.0

Hai GURUS,

When i am trying to load Master Data Text to 0MATERIAL its displying this error for both MATNR and SPRAS fields.

""<b>Conversion exit is not being executed</b>""

""<b>Message no. RSDS041</b>""

when you activate the R/3 DataSource "0MATERIAL_TEXT" I have even tried changing the Conversion type to EXTERNAL /INTERNAL but either way it was not working.Can some one please let me know the solution. Points assured

with regards

vikram