When the macro processor executes a macro program statement that can create a macro variable (such as a %LET statement), the macro processor attempts to change the value of an existing macro variable ...

However, you must use a different approach if you want to store the value of an SCL variable in a macro variable while the SCL program executes (for example, to pass values between SCL programs).

Macro programming. Problem with with running models from macro files. This bug affects version 2.1 beta 6-11 and release versions 2.10 and 2.11. When running a model(s) from a macro file, due to a bug ...