Tech Support Article CS61382 indicates that a CAD Document created by checking the create CAD Document box while creating a WTPart can not share Number. It would be a huge User aggrevation saver (and probably save some time as well) if using this checkbox were to support tighter relationships between WTPart Attributes and CAD Documents, particularly when autonumbering is enabled on the WTPart.
Ideally when creating a WTPart, selection of Create CAD Document could be configured to support the following
WTPart Number ==> CAD Document Number ==> Creo Parameter PART_NUMBER (still have not found a way to avoid this with multiple installed shapes of soft goods (hoses for example) & Creo filename (such that Creo filename = WTPARTNUMBER.prt/asm)
WTPart Name ==> CAD Document Name ==> Creo Parameter PART_NAME [or PTC_COMMON_NAME]
WTPart IBA Attibute(s) ==> CAD Document IBA Attributes ==> Creo Parameters
I do recognize that explicit mapping of Attributes takes care of much of this, but the Number and Name would be hugely beneficial. Currently there is much manual alignment of parameter values and with that potential for user error.