ttCallContextBPMData - what is the life cycle?

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We are using Epicor 9 v.9.05.604

I'm trying to use ttCallContextBPMData to store some default values for a new partLot record.

I assign them into ttCallContextBPMData during Receipt.PreUpdate(postProc), and reading back in LotSelectUpdate.GetNewPartLot.

I've verified the write, and stamped the record with "Default.PartLot" in .Character20 so that I'm sure I'm reading back the correct record. But the stamped record is no longer there in LotSelectUpdate.

Can anyone explain the "life cycle" of ttCallContextBPMData?

Thanks,
Chris