Payroll philippines 13th Month pay

Dear experts

I need to Include one If else condition logic in PCR Z133 for 13th Month Pay

I need to add the Logic to block the 13th Month pay calculation while retro acc through the period of 13th Month Pay during the year 2014.

Please let me know the if else logic/condition to be included in this rule and can we input through operation Payroll period

The releveant subschema has already been uncommented to activate this rule Z133 under subschema Z13M

Please let me know where this if else logic can be included in PCR Z133 :