Application Manager & Task exclusivity

I'm writing a program which runs all day in batch and posts Invoices from a Pc 
system to SL and GL thru the standard JBA interfaces.   The job is submitted as 
a SL task from Day Start.

I need to put code in my program to stop it from doing any posting if SL or GL 
period close is active....and I think I can do that by testing the exclusivity 
flag on APG01PHY (?)

But, as my job is itself a SL task, won't it stop SL month-end from running in 
the first place?

Just wondered if anyone can offer any advice please?

Neil.

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