How to create planned orders for the demand of only one month?

Summary:

The main supplier provides 75% of the finish goods procured and their agreement is to create monthly purchase orders for all the items that we need to procure, the planner is looking for the right configuration so the Plan will create planned orders for the demand of the items of one month.

Content (please ensure you mask any confidential information):

The lead time is for 89 days, the Fixed Days Supply are set at 24 days, there. are minimum order quantities and fixed lot multipliers, if we keep this values for months of 31 days, part of the demand is not considered; for months of 28 or 30 days part of the demand of the next month is considered. Is there any configuration that can consider the demand of the item for one the month?