function processPartTypes () {
			that.oType?.processPartTypes(that.aBindings.map(function (oBinding) {
				return oBinding.getType();
			}));
		}
Sets the optional type and internal type for the binding. The type and internal type are used
to do the parsing/formatting correctly. The internal type is the property type of the element
which the value is formatted to.

@param {sap.ui.model.CompositeType} oType
  The type for the binding
@param {string} sInternalType
  The internal type of the element property which this binding is bound against.

@public