I want my user should have a privilege **to add attachment** in customer master form and **not to delete** that attachment after uploading document. To configure this option i tried in *Setting -> Technical -> Security -> Access-Control List* and choose *ir.attachment user* and enable only **Read access** and untick all other. But not working i can delete attachment. Any other configuration for only add a attachment and not delete the attachment. Or Else any other configuration for achieve these things...
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