How to fetch the open period in Calculation Manager instead of being prompted to enter the GL Period

Summary:

While creating Cost allocations rules in EPM system workspace under calculation Manager - is there a way to create a custom function or member from a sequel script to populate the current open period? Currently we would like to automate our cost allocation process however when creating the sequential job sets we need all cost allocations are being prompted to enter in the GL Period. We would like it to default to the current period at run time.

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