EPBCS Financials how can I use OFS_Trend Based Calculation on custom Form?

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Hi all,

Tried to use the OFS_Trend Based Calculation on a custom form but apparently runs but does not produce any results. I use some custom driver accounts on the rows and selected the Prior Year Average Actuals as an option. I also cloned the "Trend Based Expenses" form, where I only  changed the account rows.

Can you please help?

Thank you