code: function (mCurrencies) {
  			// add custom units, or remove the existing ones if none are given
  			var mExistingCurrencies = this.getCustomCurrencies();
  			if (mExistingCurrencies){
  				mCurrencies = jQuery.extend({}, mExistingCurrencies, mCurrencies);
  			}
  			this.setCustomCurrencies(mCurrencies);
  			return this;
  		}
docs: Adds custom currencies to the existing entries.
  E.g.
  <code>
  {
  "KWD": {"digits": 3},
  "TND" : {"digits": 3}
  }
  </code>
  
  @public
  @param {object} mCurrencies adds to the currency map
  @returns {sap.ui.core.Configuration.FormatSettings}
  @see sap.ui.core.Configuration.FormatSettings#setCustomCurrencies