Message type: E = Error
Message class:  HRGB_LGPS - HR: Messages for LGPS 
Message number: 066
Message text: LGPS Error: Employee is in BOTH &1 and &2
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message HRGB_LGPS066, which states "LGPS Error: Employee is in BOTH &1 and &2," typically occurs in the context of the Local Government Pension Scheme (LGPS) in the UK. This error indicates that an employee is being assigned to two different pension schemes or categories simultaneously, which is not allowed.
Cause: The error arises when: An employee is assigned to two different pension schemes or categories that are mutually exclusive. There may be a configuration issue in the employee's records, such as incorrect assignment of pension scheme codes. The employee's data may have been incorrectly entered or updated, leading to conflicting information.
Solution: To resolve this error, you can take the following steps: Check Employee Records: Review the employee's master data in the SAP system to identify the pension schemes assigned. Look for any discrepancies or overlapping assignments. Use transaction codes like PA20 (Display HR Master Data) or PA30 (Maintain HR Master Data) to check the employee's
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRGB_LGPS065 LGPS 2015: Invalid Percentage (On &1, &2 section: &3)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRGB_LGPS064 Do not use this field until April 1st 2015
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRGB_LGPS067 LGPS Error: Councillors are not allowed in the 50/50 scheme
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRGB_LGPS068 LGPS Error: Feature GBLG2 returned &1 (only "X" or " " allowed)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.