ITS_INVALID_LVALUE is an ABAP runtime error which you may come across when using or developing within an SAP system. See below for the standard details explaining what it means and how you can avoid or fix this runtime error.
Short Dump Classification: A - ABAP Programming Error
You can view further information about a runtme error by using transaction code ST22 which will show you this and all runtime erros that have happen in your SAP system.
Also check out the Comments section below to view or add related contributions and example screen shots.
You might be able to find a solution in the SAP Notes system. If you
have access to the SAP Notes system, check there first using the
following keywords:
ITS_INVALID_LVALUE
<runtime parameter>
Template interpretation terminated, runtime error.
Check the entries in the system log (transaction SM21). The entries in
the system log help to determine what caused the error to occur.
Please see abap error for more details about the possible cause of this runtime error and how it could be avoided.
The HTML variables are stored in the ITS context. There might be a
problem in memory management, or maybe the context was too big, meaning
that a memory request could not be complied with.
Template <runtime parameter> has caused a runtime error in function <runtime parameter>. Cause of
error: Error while accessing a variable.
ITS_INVALID_LVALUE - its invalid lvalue ITS_INDEX_UNDERFLOW - its index underflow ITS_INDEX_OVERFLOW - its index overflow ITS_ILLEGAL_FUNCTION_NAME - its illegal function name ITS_FUNCTION_RAISED_EXCEPTION - its function raised exception ITS_FUNCTION_NESTING_NOT_ALLOW - its function nesting not allow