Capacity CTP reservations

LN calculates CTP reservations when a plan item's ATP is updated, or when an item master plan is updated.

Capacity CTP reservation

LN generates a capacity CTP reservation in the following situation:

The cumulative ATP of a plan item in a particular plan period becomes negative.
You selected the Capacity CTP check box in the Items - Planning (cprpd1100m000) session for the plan item involved.

LN generates CTP reservations for the resources that are:

Listed in the item's bill of critical capacities (BCC).
Defined as critical in CTP.

Note

When component CTP reservations and/or capacity CTP reservations are made for a plan item, the expected additionally produced quantity of the item itself is stored as CTP Reservation Receipt.

Calculation

The capacity CTP reservation is computed as follows:

CCR(t) = -NA(t) x	 CR(t)

CCR(t)	capacity CTP reservation
NA(t)	negative ATP
CR(t)	required capacity (from the bill of critical capacities)

The requirement date for the capacity CTP reservation is determined as follows:

RD = PFD - LTO

RD	requirement date for the capacity CTP reservation
PFD	finish date of the originating plan period
LTO	lead-time offset (from the bill of critical capacities)

LN records the capacity CTP reservation in the Resource Master Plan (cprmp3501m000) session in the plan period in which the requirement date falls. LN subtracts the capacity CTP reservations from the resource's capacity CTP.

You can view capacity CTP reservations and their origin in the Capacity CTP Reservations (cprmp5520m000) session. This session is accessible through the appropriate menu of the Item Master Plan (cprmp2101m000) session.