# Planning Bill Low Level Code Generation Process (PB.P3)
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The PB.P3 procedure sets the low level codes for the planning bills that are required before the PB.P1 procedure can be run to create sales forecast or master schedule items. This process only needs to be run if the multi-level option is to be used in PB.P1 .
Frequency of Use
This procedure should be run anytime the structure of the planning bill file is changed.