# NullEmptyInvalid values are coming for Mandatory fields in target system from the source system. How ## Description Null/Empty/Invalid values are coming for Mandatory fields in target system from the source system. How to prevent them? ## Solution Mandatory fields for the target system are not mapped correctly. Please perform the following steps: * De-activate the integration. Open the mapping for which you received this error in the edit mode * Map the Mandatory field with source system’s field or pass a default value by mapping the field with OH\_Default * Update the mapping, activate and save the integration again. Now, retry the failure > **Note**: The best practice to avoid this failure is to make corresponding source field mandatory or always map it with a default field value during mapping. --- # 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://opstech.gitbook.io/opstech-docs/help-center-index/faqs/general-faqs/nullemptyinvalid-values-are-coming-for-mandatory-fields-in-target-system-from-the-source-system-how.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.