Variable system Error

Hi BW Friends.
I have defined a variable as optional with process type User Entey /Default. I assigned this to Characteristics OpCo. When I run the uery I have got a mesaage as system Error. When Pressed Ok, it is working. The details of system error as below.
Could you some one help me please.
<b>Diagnosis
<u>The Can be changed in query navigation property</u> has been set for variable Z_CP_028, characteristic OpCo. However, the variable is used in the query in such a way, that the system is unable to apply this change-option.
This can, for example, occur under the following conditions:
Characteristic OpCo is filtered by additional restrictions (the restrictions must be joined using an OR-connection)
A second characteristic, which is restricted by a variable, is compounded to charcteristic OpCo.
Variable Z_CP_028 is a hierarchy node variable, but the hierarchy has not been determined uniquely.
A variable can be changed during query navigation only if it is used exclusively in a drilldown-characteristic, and there are no further restrictions to the characteristic other than this variable. There must be no additional characteristics with variables compounded to the characteristic you are working with. For variables for hierarchy nodes, the hierarchy must be determined uniquely and agree with the set display hierarchy.
Also, if the characteristic value is moved, for example (Z_CP_028 - 1), the variable is no longer able to be changed when navigating queries.
System response
The entry Z_CP_028 Can be changed during query navigation is not applied.
Procedure
Check the query definition.
Procedure for System Administration</b>

Hi Sudhakar,
For the variable that you have created, uncheck the Can Be Changed with Query Navigation option. Save the query and try to execute it once more.
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