Planning Optimization doesn't support the Today's date, First issue, and Coverage time fence options. It always uses the Today's date + procurement time option. Without the First Issue option available Planning Optimization creates a planned PO for the minimum quantity (safety stock), for a requirement date of the lead time for that particular item. This causes the planners to purchase goods that are not yet required to stock, causing capacity issues at the warehouse. It also causes issues with the supplier relationship and costs, since we are sending a small PO to the supplier way ahead of time and not consolidating the fulfill minimum qty planned PO with the demand forecast generated planned PO.

The first issue selection worked well in MRP, but is not available in planning optimization. Creating tons of manual effort and incurring costs to warehousing operations, as well as supply costs when planned PO's are being proposed well before they are required.