Bica: change the query cause error in the pas model

Dear  friends,

We have very simple scenario: one query 'SSM_SQL_KPI_MAY'' for feeding  the pas model- 2 demensions and 2 measures. With this query I load the schema and data to the pas model.Everithing was fine. After that we added new  dimension to the query.Ichanged the  existing query and load the data with bica.But when I try to open the model I get the next  error every time

DAT316:

No internal Dimenson unique name to position cache exists for 'EZOR_KEY' on Linkid 'BI' Cube 'SSMKPI/SSM_SQL_KPI_MAY'

We try to resolve the issue by deleting data and schema but every time I get the same error.

How is it possible to resolve this issue?

What isa best practice in the case of changing queries working with bica?

Thanks.

Best regards,Orit.