I currently , have 2 or more programs that serves the same function: that is to print out labels on Zebra printer.

What differs between them are, that the output is different, meaning it prints to 2 different Zebra printer.

say, I have 2 programs, ABC and DEF. ABC will be the name program, then when I execute program DEF, I'll just pass a parameter into ABC program by this line

CALL ABC(Location)

inside the program DEF , say assigned the value ADMIN_OFFICE into Location.

once the ABC program detected Location is ADMIN_OFFICE, it will print out at printer located in Admin office.

So, the problem here is, when I execute the program ABC, there's no value of Location assigned into ABC program. The ABC program goes haywire because it does not detect any value in variable Location.

how should I design my program that I can re-use it so that I don't have DEF as the duplicate of ABC?

It depends on the AREV version.

Try

Declare Function Guar_assign

Location=Guar_assign(Location)

of

If Assigned(Location) else Location="

Of

If Unassigned(Location) then Location="

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If you are getting a "Variable not assigned a value" error, aka VNAV

then you can use the Unassigned function.

if Unassigned( Location) then Location="

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