Web service action modify list inventory

Hello,

I'm trying to call the web service object to update QTYPCUNEW on a inventory's list wich is include 98 lines.

Gosub DEFVAR From WJYSLX3SNL
WW_ACTION = "READ"      : # READ, CREATE, MODIFY, DELETE, SUPLIG, INSLIG
WW_IDENT = "SES1912S0100035~INV1912S0100055"
Gosub WEBSERV From WJYSLX3SNL

WW_ACTION = "MODIFY"
NBLIG_1=10
QTYPCUNEW_1(NBLIG_1) = 3
QTYSTUNEW_1(NBLIG_1) = 3

Gosub WEBSERV From WJYSLX3SNL
Gosub ANALRESOBJ From WJYSLX3SNL
Gosub DETAILRES From WJYSLX3SNL

The action read is OK.

The trace file displays my inventory.

But X3 does not modify the QTYPCUNEW

There's no error when i try to modify.