diff --git a/entity/CampaignAddParticipants_entity/entityfields/isoperationvalid/valueProcess.js b/entity/CampaignAddParticipants_entity/entityfields/isoperationvalid/valueProcess.js
index fb39eed20e0040a1f60fb9c63c93fa050d32fc18..471416a0f8668d62254f1bcdb2f73c652b8925af 100644
--- a/entity/CampaignAddParticipants_entity/entityfields/isoperationvalid/valueProcess.js
+++ b/entity/CampaignAddParticipants_entity/entityfields/isoperationvalid/valueProcess.js
@@ -68,9 +68,17 @@ if(selectedCampaignId != '')
     else
     {
         participantCondition = JSON.parse(vars.getString("$param.campaignParticipantsCondition_param")).condition;
-        
-        countParticipantsToAdd = CampaignUtils.GetContactCountByCondition(participantCondition);
-        
+        logging.log("im isOperationValid -> ");
+        countParticipantsToAdd = CampaignUtils.GetContactCountByCondition(participantCondition, isUpdate);
+                logging.log("countParticipantsToAdd -> " + countParticipantsToAdd);
+
+        /*
+         * If the update mode is active, the goal is to move participants between steps.
+         * therefore the check if the affected participants already are added to a particluar step has to be on the step level.
+         * 
+         * If not, participants are to be added. It has to be checked if a participant is in a campaign, regardless of the particular
+         * step because one participant can be in a campaign just once.
+         */
         if(isUpdate == "true")
             whereCondition = "CAMPAIGNPARTICIPANT.CAMPAIGNSTEP_ID = '" + selectedCampaignStepId + "'";
         else
diff --git a/entity/Organisation_entity/Organisation_entity.aod b/entity/Organisation_entity/Organisation_entity.aod
index ac2e0d37071ad4bf7f8e7fbc673939e097702481..4ea751da8055b487586369cff0c75f24469b05e3 100644
--- a/entity/Organisation_entity/Organisation_entity.aod
+++ b/entity/Organisation_entity/Organisation_entity.aod
@@ -774,7 +774,7 @@
           <title>Add to Campaign</title>
           <onActionProcess>%aditoprj%/entity/Organisation_entity/entityfields/campaignactiongroup/children/addtocampaignfromtable/onActionProcess.js</onActionProcess>
           <isObjectAction v="false" />
-          <isSelectionAction v="true" />
+          <isSelectionAction v="false" />
           <iconId>NEON:GROUP_APPOINTMENT</iconId>
           <tooltip>Add the selection to a campaign</tooltip>
           <tooltipProcess>%aditoprj%/entity/Organisation_entity/entityfields/campaignactiongroup/children/addtocampaignfromtable/tooltipProcess.js</tooltipProcess>
diff --git a/entity/Organisation_entity/entityfields/campaignactiongroup/children/addtocampaignfromtable/onActionProcess.js b/entity/Organisation_entity/entityfields/campaignactiongroup/children/addtocampaignfromtable/onActionProcess.js
index 8ae8d45bb07577457f0511bdb492322be2b7cd6a..c9b89f86a88ad0145a75d7a744938b719fca4c3e 100644
--- a/entity/Organisation_entity/entityfields/campaignactiongroup/children/addtocampaignfromtable/onActionProcess.js
+++ b/entity/Organisation_entity/entityfields/campaignactiongroup/children/addtocampaignfromtable/onActionProcess.js
@@ -2,14 +2,20 @@ import("system.vars");
 import("system.neon");
 import("Campaign_lib");
 
-var sysSelection = vars.getString("sys.selection");
+var sysSelection = vars.get("$sys.selection");
 
+/*
+ * If there's a selection only those are ought to be added.
+ * Otherwise the filter gets checked, if a filter has beed set, the condition
+ * is used to determine the objects to be added.
+ * If no selection has been set, all objects will be added.
+ */
 if(sysSelection.length > 0) //selektierte IDs als Array
 {
-    CampaignUtils.addParticipantsByRowIds(sysSelection, "ORGANISATION");
+    CampaignUtils.addParticipantsByRowIds(JSON.stringify(sysSelection), "ORGANISATION");
 }
 else
 {
     let sysFilter = vars.get("$sys.filter");//todo change name
-    CampaignUtils.addParticipantsByCondition(sysFilter.condition, "ORGANISATION");
+    CampaignUtils.addParticipantsByCondition(JSON.stringify(sysFilter), "ORGANISATION");
 }
\ No newline at end of file
diff --git a/process/Campaign_lib/process.js b/process/Campaign_lib/process.js
index 9fc534013e2ee915ed7cef03af48d1bc0b837f99..e16e5b948a2e8d13f493eb624f29940f510e8580 100644
--- a/process/Campaign_lib/process.js
+++ b/process/Campaign_lib/process.js
@@ -343,8 +343,10 @@ CampaignUtils.GetParticipantsAlreadyAddedCountByCondition = function(pWhereCondi
     + " left join ADDRESS on (ADDRESS.ADDRESSID = CONTACT.ADDRESS_ID)"
     + " left join CAMPAIGNPARTICIPANT on CAMPAIGNPARTICIPANT.CONTACT_ID = CONTACT.CONTACTID"
     + " where " + pWhereCondition
-    + " and " + pCondition;
 
+    if(pCondition != "")
+        query += " and " + pCondition;
+    
     logging.log("GetParticipantsAlreadyAddedCountByCondition query -> " + query);
 
     return db.cell(query)
@@ -369,11 +371,13 @@ CampaignUtils.GetContactIdsNotInCampaignByCondition = function(pCampaignId, pCon
     + " join CONTACT on (CONTACT.PERSON_ID = PERSON.PERSONID)"
     + " join ORGANISATION on (ORGANISATION.ORGANISATIONID = CONTACT.ORGANISATION_ID)"
     + " left join ADDRESS on (ADDRESS.ADDRESSID = CONTACT.ADDRESS_ID)"
-    + " where " + pCondition
-    + " and CONTACT.CONTACTID not in"
+    + " where CONTACT.CONTACTID not in"
     + " (select CAMPAIGNPARTICIPANT.CONTACT_ID from CAMPAIGNPARTICIPANT where"
     + " CAMPAIGNPARTICIPANT.CAMPAIGN_ID = '" + pCampaignId + "')";
     
+    if(pCondition != "")
+        query += " and " + pCondition;
+    
     return db.array(db.COLUMN, query);
 }
 
@@ -390,13 +394,15 @@ CampaignUtils.GetContactIdsInCampaignByCondition = function(pCampaignId, pCondit
     return db.array(db.COLUMN, query);
 }
 
-CampaignUtils.GetContactCountByCondition = function(pCondition)
+CampaignUtils.GetContactCountByCondition = function(pCondition, pLookInCampaignOnly)
 {
     let query = "select count(*) from PERSON"
                 + " join CONTACT on (CONTACT.PERSON_ID = PERSON.PERSONID)"
                 + " join ORGANISATION on (ORGANISATION.ORGANISATIONID = CONTACT.ORGANISATION_ID)"
                 + " left join ADDRESS on (ADDRESS.ADDRESSID = CONTACT.ADDRESS_ID)"
-                + " left join CAMPAIGNPARTICIPANT on CAMPAIGNPARTICIPANT.CONTACT_ID = CONTACT.CONTACTID";
+                
+    if(pLookInCampaignOnly == "true")
+        query += " left join CAMPAIGNPARTICIPANT on CAMPAIGNPARTICIPANT.CONTACT_ID = CONTACT.CONTACTID";
     
     if(pCondition != "")
         query += " where " + pCondition;