question about sccm advertisements

we today deployed a script file that upgrades the ica client and advertised it to a colllection. soon after we advertised we found that there was a small mistake in the script and disabled the advertisement. we deleted the advertisement also. in the reports it shows that some 200 compuets have acepted the advertisement. now we want to deploy the advertisement again. wanted to ask if the first ADvertisement, will it still run. and how to make sure the first one never runs as we are running another one with the same job with some corrections. please advise
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