Macro to put the material of part in the material property

What i try , i cannot fill the property material with the material of the part.

Manually i can click on file properties >custom  and choose material in the second column.

Then i get such as sw-material@.....

Now i want to do this with a macro. But when i try to record , i see nothing.

What do i have to fill in for the word default that the macro puts from every opened part the material from the feature tree in the properties ?

swCustPropMgr.Add3 "Material", swCustomInfoText, Default, swCustomPropertyReplaceValue

SolidworksApi macros