Change existing fiscal data pattern from 13 to 14 Period

I have got the following Scenario 

Existing or current  setting  of Date Pattern :   13 Periods

Fiscal Date Pattern A FY 2018

Period 1 Begin 02/07/2018

                End 29 07 2018

Period 12 End 02/06/2019

Period 13 End 30/06/2019

Period 14 End 30/06/2019

New Setting : User wants Date Pattern A  to be 14 Periods instead of 13

For example: Fiscal year 2018

Period End 13          29 06 2019

Period End 14           30 06 2019  (One Day)

Is there any implication re defining A Pattern to 14 instead 13 ?  Any G/L reports to Run or the need to go back and define 2017 ?

I am not able to find any Doc Id re the above  Scenario.

Any thoughts would help ?

Many thanks

Saleem Fanous Redfaire