Blocked vacuum hose (identifying help needed!)

[Matich 6]

Have been refreshing a m50b25 NV and noticed that this hose has been blocked by a previous owner, after hours of searching I couldn't find what it was originally responsible for, any ideas? 

[BM WORLD 1283]

part 5 I think in link below

http://bmwfans.info/parts-catalog/E36-Coupe/Europe/325i-M50/R/1991/browse/engine/crankcase_ventilation/

 

also wheres the fuel reg vac line go ?

to part 11 ? in link below

http://bmwfans.info/parts-catalog/E36-Coupe/Europe/325i-M50/R/1991/browse/engine/intake_manifold_system/

 

some other places for hoses

http://bmwfans.info/parts-catalog/E36-Coupe/Europe/325i-M50/R/1991/browse/fuel_preparation_system/fuel_tank_breath_valve_disturb_air_valve/

 

http://bmwfans.info/parts-catalog/E36-Coupe/Europe/325i-M50/R/1991/browse/fuel_preparation_system/valves_pipes_of_fuel_injection_system/

 

[Matich 6]

Part 5 was cut and is venting to atmosphere so maybe it did go there? I thought since the PCV hose (#3/#4) was already going into the intake boot it wouldn't need another tiny hose post throttle body.