Hello,
I think the macro function PRODUCT_PHOUT_END you mentioned is to get the date that is set in /SAPAPO/MSDP_FCST1 -> Assignment, instead of the end date in the attached screenshot which is the time series setting.
Sorry but I don't think there's a macro function that could get/set the % data in time series settings.
You can consider using FM /SAPAPO/FCST_PHINOUT_TSID_SAVE in a BADI macro.
Best Regards,
Ada