Activity: category is mandatory

entity/Activity_entity/Activity_entity.aod

@@ -50,7 +50,7 @@
       <title>Category</title>
       <consumer>KeywordCategories</consumer>
       <groupable v="true" />
-      <mandatory v="false" />
+      <mandatory v="true" />
       <displayValueProcess>%aditoprj%/entity/Activity_entity/entityfields/category/displayValueProcess.js</displayValueProcess>
     </entityField>
     <entityField>