Solution : https://service.sap.com/sap/support/notes/593981 (SAP Service marketplace login required)
Key words :
alter table &tab_name& add constraint &pri_key& primary key, terms udb uniquerule db2 reason, create unique index &pri_key&, create &unique& index &ind_name&, missing primary key, db2 universal databases, alter table, tpl control file, primary key, sap data dictionary