# Lot Control Lot control is a vital component in the traceability of products in the supply chain. In the edit screen for product select the Lot Controlled box, if required you can enter the Lot Patten. LOT pattern will help prevent errors in the data entry of LOTS. Example of LOT Pattern: Your LOT number for this item is BB-21xxxx, with the x being the month and day of the production LOT. The LOT Pattern would be BB-21\_\_\_\_ (4 underscores) with the pattern in place the lot entered must always follow this rule. {% hint style="danger" %} Attribute settings need to be selected priory to transacting any transactions for this product in the system. {% endhint %} ![](/files/-Me04Y2MPc5qIoBg-V2P) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.p4.software/p4warehouse-english/setup/products/lot-control.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.