function isRelevant(oMessage, sContentID) {
					if (i === 0 && !sContentID) {
						// w/o ContentID, report as unbound message at 1st request
						if (oMessage.target) {
							oMessage.message = oMessage.target + ": " + oMessage.message;
						}
						delete oMessage.target; // delete also empty target
						return true;
					}
					return sContentID === oRequest.$ContentID;
				}
Decomposes the given error into an array of errors, one for each of the given requests.

@param {Error} oError
  The error created by {@link .createError}.
@param {object} oError.error
  An error response as sent from the OData server
@param {object[]} [oError.error.details]
  A list of detail messages sent from the OData server. These messages are filtered and
  assigned to the corresponding request.
@param {object[]} aRequests
  Requests belonging to a single change set
@param {string} sServiceUrl
  URL of the service document used to resolve relative request URLs
@returns {Error[]}
  One error for each request given, suitable for
  {@link sap.ui.model.odata.v4.ODataModel#reportError} and marked as
  <code>decomposed</code>

@public