objRecord.removeLine available on custom child records

I would like to know if Record.removeLine(options) is available for use on custom child records. I have the following code:

    for(var i = 0; i < ct; i++){     

               objRecord.removeLine({sublistId: 'recmachcustrecord_sot_item',

                                     line: i,

                                     ignoreRecalc: true

               });

    }

In all instances, I receive an error.

<span class="json-key" style="color: brown;">cause</span>: {<br/>   <span class="json-key" style="color: brown;">name</span>: <span class="json-string" style="color: olive;">"ATP_MR_PROCESSOR"</span>,<br/>   <span class="json-key" style="color: brown;">message</span>: <span class="json-string" style="color: olive;">"["Error: 106392. Error was: You have attempted an invalid sublist or line item operation. You are either trying to access a field on a non-existent line or you are trying to add or remove lines from a static sublist.\\n"]"</span><br/>  },