2438975 - 'ERROR: do_build_select_stmt failed: No such file or directory' during export with R3load

During the installation or import of a system copy, in the <object>.log (i.e.: SAPSLEXC.log)  there are errors like this:

(SQL) ERROR: Duplicate entry for index '' in l.6 '<export directory>/DB/<dbs>/<package>.SQL' and l.6 ''<export directory>/DB/<dbs>/<package>.SQL'
(DB) INFO: Disconnected from DB
(EXP) ERROR: do_build_select_stmt failed: No such file or directory

or

(SQL) ERROR: Cannot read ''<export directory>/DB/<dbs>/<package>.SQL': No such file or directory
(DB) INFO: Disconnected from DB
(EXP) ERROR: do_build_select_stmt failed: No such file or directory

• System based on NW 7.1 or above;
• Any database;
• Any operational system.

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