SAPSQL_ARRAY_INSERT_DUPREC error in PM_PARTNER_MAINTAIN

Hi every one.

My problem is as follow:

I create a Quality notification using function GENERATE_NOTIFICATION,and just before I assing a partner using function PM_PARTNER_MAINTAIN.

The problem come when, after that, I try to change the user status of the quality notification using function IQS4_CHANGE_USR_STAT_NOTIF. This do not make the update since a dumb "SAPSQL_ARRAY_INSERT_DUPREC " occurs (This dump occurs in a new call to PM_PARTNER_MAINTAIN into change status function)

This error no occur if I do not call function IQS4_CHANGE_USR_STAT_NOTIF in the program and then i call it manually from SE37.

Thanks in advance for your help.

Regards.