Solution : https://service.sap.com/sap/support/notes/400434 (SAP Service marketplace login required)
Summary : 
      This SAP Note elaborates on the authorization concepts employed within APO Demand Planning, detailing the use of numerous authorization objects for access control and activity regulation across diverse APO components. For DP, objects like C_APO_MAC and C_APO_ADV govern macro-related actions, C_APO_TLAN manages transportation lane permissions, and C_APO_FUN and C_APO_ADVN handle SDP functions and macro names respectively. Additionally, it discusses authorization details for planning books (C_APO_PB), selection in planning areas (C_APO_SEL3), master data access (C_APO_LOC, C_APO_PROD), and planning versions (C_APO_VERS). Authorization checks are facilitated via the function module /SAPAPO/MCP_PERMISSION_CHECK2, with customization options through USER EXIT EXIT_/SAPAPO/SAPLMCPR_015. The note also specifies conditions where standard authorization objects do not suffice and the use of user exits is obligatory, particularly in scenarios involving complex characteristic checks in interactive planning sessions.
Key words : 
forecast profile  apo_statpf univariate forecast profile  apo_mlrpf mlr forecast profile  apo_comppf combined forecast profilec_apo_tsid, apo_selid selection id  apo_parea planning area  apo_plbk2 planning book  apo_vers apo plan versionc_apo_mod, apo_view planning view --- generated dynamically  apo_plbk planning layout ---, apo_locfr  start location  apo_locto  target location  apo_tmodmeans, inactive  apo_vers apo plan versionc_apo_loc, apo_parea planning area  apo_plbk2 planning book <---, apo_plbk2 planning book  apo_dview data viewc_apo_sel3, maintain   apo_vers apo plan versionc_apo_sel2, supply chain network  apo_apkz application indicator, apo_plbk planning layout --- generated automatically
Related Notes : 
       
| 1464451 | Authorisations in APO Master Data | 
| 941415 | Capacity view: authority check over location. | 
| 786732 | Authorization check for the object C_APO_TLAN | 
| 724095 | SDP Selector: Authorization check for location products | 
| 704416 | Realignment: Authorization objects C_APO_RLG and C_APO_CPY | 
| 700659 | Security Guide: mySAP Supply Chain Management | 
| 669496 | SCM 4.1 upgrade: Additional authorization checks | 
| 627983 | Addition BAdI /SAPAPO/SDP_FCSTAUTH | 
| 600882 | CLPSDP: the user can change the data without authorization | 
| 541703 | Collective consulting note on technical subjects in DP | 
| 445837 | Assignment of users to planning books/data views | 
| 437293 | Enhancing user exit authorizations with an object structure | 
| 436400 | Enhancement user exit authorizations for data view | 
| 420294 | Authorization check for the object C_APO_TLAN (Part 2) | 
| 415468 | Errors in authorization check for APO version (C_APO_VERS) | 
| 414431 | APO 3.0: Hiding function keys in the forecast view | 
| 413623 | Authorization check for the C_APO_TLAN object | 
| 399891 | SDP selector: Authorization for location products | 
| 387493 | Missing authorization check for planning book | 
| 321503 | Auth. check with drill-down/ dependent objects |