Missing Values in the Input Data Set

The BOM Procedure

Missing Values in the Input Data Set

The following table summarizes the treatment of missing values for variables in the Single-level BOM input data set.

Table 1.5: Treatment of Missing Values in the BOM Procedure

Variable	Value Used / Assumption Made / Action Taken
Component	value ignored
ID	missing, if Part is not missing;
	otherwise ignored
LeadTime	0, if Part is not missing;
	otherwise ignored
Part	input error: procedure stops with error message, if this is the first record;
	otherwise, treat this record as a continuation of the previous record
QtyOnHand	0, if Part is not missing;
	otherwise ignored
Quantity	1, if corresponding Component variable is not missing;
	otherwise ignored
Requirement	ignored if Part is missing;
	1, if Part is not missing and the part identified by the Part
	variable is a final product;
	otherwise, the value is determined by the procedure

Note that a missing value is allowed for the Part variable only when the information for an item is specified in more than one record (see Figure 1.1 as an example). If the Part variable is missing, the values for the ID, LeadTime, QtyOnHand, and Requirement variables are ignored by the procedure. If the Part variable is not missing and the item identified by the Part variable is not a master schedule item (that is, it is not a final product and the value of the corresponding Requirement variable is missing), the gross requirement of this part is determined based on the dependent demand process. See the "Summarized Bills of Material Data Set" section for details about the dependent demand process.

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