In Microsoft Dynamics NAV, the "Blocked" Boolean field on the Item card can be used to prevent items from being used in sales or purchase transactions. If this field is inactive or not functioning as expected, it could be due to several reasons:
Permissions: Ensure that you have the necessary permissions to modify the "Blocked" field. Sometimes, user roles and permissions can restrict access to certain fields.
Customization: The field might have been customized or modified in your NAV environment. Customizations can sometimes affect the default behavior of fields.
Page Design: The field might be hidden or not included in the page design. You can check the page design to ensure the field is visible and editable.
Data Issues: There might be data integrity issues or specific conditions that prevent the field from being active.
May this can help : https://learn.microsoft.com/en-us/dynamics365/business-central/inventory-how-block-items
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