SAP Note 23399 - Maintain settlement structure in PM Customizing

Symptom:

When you try to maintain the settlement structure on the detail screen, you return to the Customizing Guide again.
You cannot call the detail screen.

Cause and prerequisites

Missing table entry in table SOBJ

Solution
Call transaction SOBJ:
Select transaction OKO6 on the screen.
Then call table 'Other view' and select 'Subobjects'.
Maintain the new subobject:
SUBOBJECT: 'IH-ABRECHN'
Transaction code 'OKO6'
Documentation type 'O'
Book SIMG_OLIA
Doc. class SIMG
Document name SIMG_CFMENUOLIAOKO61

Save the entry.