The issue with the fetchxml filtering condition in a subgrid. We are passing the fetchxml in the subgrid filter, but the results are not correct.  

 This is the first-time implementation and we are using customized code without following any specific document. The issue is related to the behavior of records with special character (&) symbol. 

Its OOB GridControl.setFilterXml(FetchXML); functionality.

We are using this code in custom javascript, really special character (&) are the limitations.only for those records which has special character symbols (&). This special character symbols (&) should allow in the function.