When you are creating a WSDL the attributes are presented according the sequence as they are ordered in the selected entities.
Sometimes a modification is needed and a new attribute has to be added to a current WSDL. In that case the new attribute is added at the bottom of the given WSDL.
It would save time if a possibility was given to reorder attributes within the WSDL. Perheps with arrow buttons like attributes within entities in the datamodel.
There's a quick workaround for this limitation: remove microflow from webservice and add it again.