Two likely causes of not producing an expected number of hits on the part numbers entered are: part number values can change with each variation product, and the part number value is in a formula field that uses other field values. A variation product is a product that has different variations based on attributes, such as color or size1, [12]. A part number is a unique identifier for a product or a variation product1, [13]. If part number values can change with each variation product, then searching for a part number may not return all the relevant results, because some variation products may have different part numbers than their parent products. If the part number value is in a formula field that uses other field values, then searching for a part number may not return any results, because formula fields are not searchable by default. Reference: Salesforce Accredited B2B Commerce Administrator Exam Guide, Product Variations and Attributes, Part Number Field, Formula Field Considerations