Hi M. ALEX,

for this constraint,

c4: forall ( v in V) ( sum of i in SEGP (0) ) X _{0iv }=1 ; to say all successors of node 0 ( 0 is the index of dépot)

c5: forall ( v in V) ( sum of i in SEGM (0) ) X _{i0v }=1 ; to say all predecessors of node 0 ( 0 is

but in c5 : i have error

best regards