Error : [nQSError: 13015] You do not have the permission to set the value of the variable

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Error getting drill information: SET VARIABLE LOB='APD' SELECT item.item saw_0, valueof(nq_session.LOB) saw_1 FROM OLEM   Error Details Error Codes: YQCO4T56:OPR4ONWY:U9IM8TAC:OI2DL65P Odbc driver returned an error (SQLExecDirectW). State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 13015] You do not have the permission to set the value of the variable 'LOB'. (HY000) SQL Issued: {call NQSGetLevelDrillability('SET VARIABLE LOB=''APD'' SELECT item.item saw_0, valueof(nq_session.LOB) saw_1 FROM OLEM')}

 This is the common error, the developers get, when he try to change the value of session variable using request variable in request prefix field. ( refer how to change the value of session variable using Request Variable ).

Solution :
 Go to properties of session variable all check the option "Enable everyone to set value"

Follow the below steps :

1. Open Administration Tool. Go to Manager > Variables.

2. Select System or Non-System variable (depends on type of your variable) under the Session  from left pane. Then the corresponding variables will be listed on right pane.

3. Right click on the variable(for which your getting error in presentation service when you tried to change its value) and select properties.

4. check the option "Enable everyone to set value" (by default this option is unchecked) and click OK.

Now, check the request in presentation service. Log out from that session and again login to presentation services and the same report. If you get the same error again, please let me know by your comments.