In SAP S/4HANA, the validity of a bill of material (BOM) (transaction CS01/CS02) can be restricted as follows:

By plant(B): BOMs are plant-specific by default (field: Plant in CS01). A BOM created for one plant (e.g., 0001) is not valid in another (e.g., 0002) unless copied or extended (CS07), limiting its applicability to the specified plant.

By period(C): The BOM header (CS02) includes "Valid From" and "Valid To" dates, restricting its use to a specific time range. MRP and production orders only select BOMs valid on the required date, allowing versioning or phase-outs (e.g., engineering changes via ECM).

By material type(A) influences which materials can be included in a BOM (e.g., FERT for finished goods), but it doesn’t limit the BOM’s validity—it’s a material attribute.By material status(D) (material master, Basic Data) can block a material from use, but it affects the material, not the BOM’s validity directly. This aligns with SAP’s BOM management rules.