CRX-API-0005 after upgrading 8.1.1 to 8.1.2

[joaco]

Hi,
 A report, created by report studio, shows this error CRX-API-0005 after upgrading Cognos 8 from MR1 to MR2. A bolean variable is used like style variable in severals columns of a list. The date item that it used in boolean variable doesn´t use in any column os the list. It is by this in the list's  properties  Data -> Properties whe have selected the data item. Even so the error is shown.

Any help  i'll be thankful

BR, Joaco