Check of material availability

For purchased material, the CDT function checks if there will be a shortage within the lead time. Shortage is checked against definite shortage, not taking safety stock into consideration.

CDT finds out how much it is possible to reschedule (schedule earlier) without there being a problem with included material. If a shortage does not occur during the lead time, it means the material is not critical for the delivery time. If there is no shortage because there is already at least one purchase order covering the requirement in time, then you will in the result window see the delivery date for the order, regardless if these purchase orders are confirmed by suppliers or not. If you are using a purchase order within lead time to cover the requirement created by the CDT, then then order's delivery date will be used as availability date for the material.

For included stock driven manufactured parts, the same set of rules will apply as for purchased parts, unless you select to analyze their lead time (this is selected with the CDT setting Check included stock driven part). In that case the CDT function will do a flow analysis of the manufacturing order for each included stock driven part, and it will calculate a new finish date for that manufacturing order which is then used in the result of the CDT. If there is an existing order (even it is beyond the lead time) it will be waited for, if it results in the CDT does not have to make a new order.

The analysis if the material availability will result in one or several materials being critical regarding the delivery time if the difference between when the material is required and when you expect to have it available is greater than the difference on the operations (the analysis of capacity availability).

If the material is critical for the delivery time the CDT can suggest you to change to an alternative supplier if this supplier has a shorter lead time. If an alternative supplier has the same lead time as the regular supplier, the CDT will instead suggest the most inexpensive supplier. A replanning to an alternative supplier is saved so it can also be used at a later time when registering an order, regardless if an order is registered directly or after a net requirement calculation.

Parts which are not stock updated or parts with the lot sizing rule No requirement calculation, are not included in the analysis of material availability.

In distinction to purchased material, it is not always possible to trust the part's lead time in the part register for stock driven manufactured parts. The CDT function checks if there are shortages within the lead time or if all shortages are so far ahead in time that it is OK to take material from an already registered order, provided that a refill can be made of new parts before the next requirement.

When a stock driven manufactured part is a main part, or is selected to be lead time analyzed (as included stock driven part) the CDT will not take the part data's throughput time into consideration. A current throughput time will instead be calculated based on the current capacity availability and material availability. For example, if the pre-calculation says three days but that we at the moment have a high loading or a low material availability, then it can result in throughput time of five days.

The throughput time is calculated via CDT of the greatest value of the order quantity and the requirement quantity, with today's date as initial date. The calculation is the same as the calculation you can make without an order, using only the part's order quantity as a basis (using the button Run CDT in the Part register procedure).

If you select not to do a lead time analysis of included stock driven parts, then the throughput time including material procurement will be used as lead time. However, the CDT function always analyzes stock driven main parts to see if new manufacturing is needed.

The date the analysis in CDT is based on for included stock driven parts, is the requirement date based on the desired delivery date/finish date for the part one level up in the structure.

If coordinated processing is applied, all the parts in the coordinated processing are included in the analysis. All incorporated/included material and loading are also included in the analysis, even if it is only one of the parts that you are selling on a customer order. The delivery date/finish date which is the latest in the analysis of the parts, will be the delivery date which applies for the part in the customer order.

The result for a stock driven part is based on the material which has maximum difference between the requirement date and the "new date". This maximum difference is added to the date which the analysis is based on for the part. This will then result in a new date on that level.