code: function onSubmit() {
  					oRequestLock = that.oRequestor.getModelInterface()
  						.lockGroup(sGroupId, true, that);
  					if (fnPatchSent) {
  						fnPatchSent();
  					}
  				}
docs: /*
  Synchronous callback called when the request is put on the wire. Locks the group
  so that further requests created via {@link ODataModel#submitBatch} wait until
  this request has returned and its response is applied to the cache.