If you are making a custom session - then just have that session call tifmc0110m000 to create a serial number for you and return it. So basically your custom session runs tifmc0110m00 in the background. Then once you have it working you can always move that code for tifmc0110m000 to a library - then other sessions could use it. I am not familiar with this session so can't really help. And maybe I mis-understood the question.
My latest mantra - make sure you have latest stpapi patches and the latest session object. If on LN then please explore the option of using DAL2 functionality.
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