12.0.6 : Some OEX forms are not generating using adadmin

Hi,
When using adadmin to generate forms for module ONT
some forms are not generating but all others (including pll) are compiling :

The following Oracle Forms objects did not generate successfully:

ont forms/US OEXOEORD.fmx
ont forms/US OEXOERLI.fmx
ont forms/US OEXOETEL.fmx
ont forms/US OEXOEVER.fmx


File name : adwork003.log
---------------------------------------------
ERROR generating form "forms/US/OEXOERLI.fmx" from input file

Compiling WHEN-WINDOW-ACTIVATED trigger on form...
Compilation error on WHEN-WINDOW-ACTIVATED trigger on form:
PL/SQL ERROR 201 at line 2, column 1
identifier 'MANUAL_ORDERS.SET_WINDOW' must be declared
PL/SQL ERROR 0 at line 2, column 1
Statement ignored