How to Filter SubGrid Lookup view in Dynamics 365 CRM. Please check the comments in the below code and do follow the steps accordingly and call the filterSubGrid() funtion on onload. var LastQuery = ""; function filterSubGrid() { debugger; setSubgridLookupFiltering(); } function AddLookupFilter(entity_type, customFilter) { var subgridLookup = Xrm.Page.getControl("lookup_Contacts_Participants"); subgridLookup.addCustomFilter(customFilter, entity_type); } function setSubgridLookupFiltering() { var subgridAddButtonId = "Contacts_Participants_addImageButton"; //Try to get the element from both the current and the parent document. var subgridAddButton = document.getElementById(subgridAddButtonId) || window.parent.document.getElementById(subgridAddButtonId); //This script may run before the subgrid has been fully loaded on the form. If this is the case, //delay and retry until the subgrid has been loaded. if (subg...