The “Consider On Order” field must be selected to permit entry of the “Delivery Days Limit” field. This field determines the number of days to consider (updated) purchase orders for the replenish run.
The “Required PO Type” field is disabled because of the system configuration (system parameter STOCK_REPL_USE_REPL_TYPES = Y) which means the system will determine the PO type based on the style master (or style-vendor if defined). It’s set the same way in BU 1 but it looks like the parameter was changed back in February so you might see values in replenish entries in BU 1.