Save As feature
Yes it is possible to clear attribute value. through Save As Event PX. You have to set the particular attribute as blank in your PX.
I have the same issue before, I use the event trigger through Save as Event PX , but It must be notice if the old change name:ECO-001, the save as change name :ECO-002. the program get the dataObject is ECO-001. if you want to clean the ECO-002 some attribute where the data is from ECO-001, currently I get the ECO-001 history table, and the condition is Action status is Save as and get the Affected Object , it can get the ECO-002.