Hi @tazz_bh,
If &_INPUT has multiple observations then the condition if situation = 'true' would be executed in sequence for every record in &_INPUT, so if any observation in the input data set allows this condition to be true then call symput() will be executed and message will have been set up as a macro variable with the value of "this is my message", and this would not be overwritten.
If &_INPUT only has one observation, then you might have to disconnect your SAS session as the macro variable message will hold its value between runs.
You can try testing with a new session with a value of 'false' first and see if that sends the message.
If this does not address your issue then please share some of the contents of &_INPUT and state how many rows it has.
Kind regards,
Amir.
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