The [[Documents_(UBIK_Android)#Redlining|redlining]] feature creates a copy of the [[DOCUMENT|document]] and opens it for editing with any installed 3rd party application. Enabling redlining for certain document objects requires that the following criteria are met:
# '''Criterion 1:''' A [[FILEDOCUMENT|file document]] [[MetaClass]] is prepared for Redlining
* Set the [[SYSCLS_REDLINEDFILE]] classification on a [[MetaClass]] for [[FILEDOCUMENT|file documents]] using the {{CD}} control (the MetaClass must derive from [[FILEDOCUMENT]])
<br/>[[File:UI_HowTo_Prepare_a_Document_for_Redlining_01.png|330 px|border|alt=Redlined document|Redlined document classification]]
# '''Criterion 2:''' File documents can be created as child objects of other file documents
# Create a new relation between the MetaClasse of the original file document ant the redlined file document
<br/>[[File:UI_HowTo_Prepare_a_Document_for_Redlining_02.png|330 px|border|alt=Create relation|Create relation]]