Refreshing the Data Source View in Analysis Services

I have added columns to the SQL Database table that is used as a dimension in an Analysis Services Cube. The new columns will be used as additional Property Fields for the dimension. When I attempted to refresh the Data Source view so that the additional columns are present, I am given the following error:
System.Data
Property not accessible because 'Parent Columns and Child Columns don't have type-matching columns'
I have done nothing to the columns used for the parent of child and the error message provides nothing to gon on. Does anyone have any ideas on this?
Gary

Olga,
Thanks for your response. I will try and answer your questions
1) I have not tried removing the columns yet. I will try that this afternoon but have limited hope. The two columns I added are simple text columns that will be used as attributes in the dimension. I have made no change to the parent or child columns.
2) The table I modified is the source table for a parent-child dimension.
3) The reference to the "check list" does not take me to any kind of check list.
4) The parent-child dimensions I am trying to modify have been in use for months and the parent and child columns do have the dame data types.
5) I have also check the data types between the dimension table and the fact table. they use the same data types (small int).
6) I have not made a collection for the parent key, it is a single column. The remainder of your last paragraph is not clear to me. Can you give me an example.
I am fairly inexperienced with Analysis Services, please talk slow and use small words :-)
Thanks again for your help!
Gary

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