Solution : https://service.sap.com/sap/support/notes/70815 (SAP Service marketplace login required)
Summary : 
      Following the upgrade from Release 2.2 to 3.0, absence of phantom assembly allocations in routings was observed, identified as a program error. Resolution involves the creation of function module CM_BT_PHANTOMS_TRANSFORM within program LCMBTU48. This function aims to adjust the level and path configurations of phantom assemblies. Additionally, corrections are required in the FORM routines EXTRACT_POSITIONS and CHK_EXISTENCE of programs LCMDIFE1 and LCMDIFC1 respectively. Implement these corrections to restore proper function and display of component allocations in the updated system version.
Key words : 
import parameter    reference field stlty               stas-stltystlnr               stas-stlnrstlal               stas-stlalstlkn               stas-stlknstufe               stpob-stufe1weg                 stpob-wegxx1, additional key words component allocation, correct form routine extract_positions, correct form routine chk_existence, create function module cm_bt_phantoms_transform, import parameters, function group cmbt, possibly converts level, prerequisites program error, function module
Related Notes : 
       
| 91805 | Phantom assemblies in recipe | 
| 82644 | Component allocation of phantom assemblies (routing) |