Diagnosis
The syntax check found an error in a variable definition.

System Response
The cursor marks the place where the error occurs.

Procedure
For example, in a constraint you have defined a name for an variablelinked to an object and/or a characteristic. This name is a reservedname, for example:
DESK IS_A ... WHERE SIN = ..
Certain names are reserved - for example, SIN for the standard functionfor sines.
Rename the variable. You could do this by putting a query in front ofthe name, for example:
?DESK IS_A ... WHERE ?SIN = ..