diff --git a/assets/js/aap/aap.js b/assets/js/aap/aap.js
index a312386f92bcafde3f109f8adf6213e0d5e929a8..d76c4e10ae8bf7cb37f8dc1fa02b837db1de08d1 100755
--- a/assets/js/aap/aap.js
+++ b/assets/js/aap/aap.js
@@ -6217,6 +6217,12 @@ var aapObj = {
 								ajaxPost(null, url, post, function (html) {
 									$('#action-modal-preview').empty().html(html);
 								}, null, 'text');
+							},
+							onContributorRemove: arg => {
+								coInterface.actions.request_participation({
+									action: arg.cardData.id,
+									contributors: arg.list.map(c => c.id),
+								}).then(r => toastr.success(JSON.stringify(r)));
 							}
 						});
 					$(document.body).off('action.set-contributor').on('action.set-contributor', function (event, data) {
diff --git a/assets/js/co.js b/assets/js/co.js
index 4d1c74d516fc527bb0dd45ed4b68310d090ec6de..89af83918895c79345ff42bbb3be358c9bde3dd3 100755
--- a/assets/js/co.js
+++ b/assets/js/co.js
@@ -1948,10 +1948,26 @@ var coInterface = {
 		},
 		request_participation: function (args) {
 			return new Promise(function (resolve, reject) {
+				const fn = "request_participation";
+				
 				if (typeof args !== 'object' || !args)
-					reject('Undefined argument');
-				else if (typeof args.action === 'undefined' || typeof args.contributor === 'undefined')
-					reject('Argument error');
+					reject({
+						side: "client",
+						msg: "Argument format error",
+						fn,
+					});
+				else if (typeof args.action === 'undefined')
+					reject({
+						side: "client",
+						msg: "Undefined action id",
+						fn,
+					});
+				else if (typeof args.contributor === "undefined" && typeof args.contributors === "undefined")
+					reject({
+						side: "client",
+						msg: "Should provide contributor id(s)",
+						fn,
+					});
 				else {
 					var url = baseUrl;
 					if (typeof args.server_url === 'string')
@@ -1959,13 +1975,17 @@ var coInterface = {
 					url += '/costum/project/action/request/set_contributors';
 					var post = {
 						action: args.action,
-						contributor: args.contributor,
 						emiter: wsCO && wsCO.id ? wsCO.id : ''
 					};
-					if (typeof args.participate === 'number')
-						post.participate = args.participate;
-					else
-						post.participate = 0;
+					if (typeof args.contributors === "object")
+						post.contributors = args.contributors;
+					else if (typeof args.contributor === "string") {
+						post.contributor = args.contributor;
+						if (typeof args.participate === 'number')
+							post.participate = args.participate;
+						else
+							post.participate = 0;
+					}
 					ajaxPost(null, url, post, resolve, reject);
 				}
 			});