master data issue

hi,

i am having three key fields in the source i.e data source and this is for masterdata and i want text so in infoprovider text i am having only two keyfield objects so i had added attribute in the infoprovider i.e master data but what ever the attribute ihad added in the infoprovider i am unable to see that attribute in text source in transformation so i am unable to map one key field and i am getting error when loading dtp can anyone please say how to get field for text source after adding attribute.