in lsmw

i have one doubt in lsmw. actually iam uploading data for MM01. Here iam selecting nearly 10 views . In one view , for material and sales unit if i give same unit of measure, conversion screen will not appear. If i give different unit of measure conversion screen will appear. while recording i have done for different units of measure, it is working fine for that. but it is not working for same units of measure. this uploading has been stopped due o this . can you help me