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The document Data Repository Cell [1] says on page 8 that the field INSTANCE_NUM may be null (NULLABLE = YES in table column). In fact, the column instance_num in the table observation_fact is not nullable.
I could only test this in an Oracle database so I can't tell if Postgres is also affected by this documentation gap.
[1] https://www.i2b2.org/software/files/PDF/current/CRC_Design.pdf
I could only test this in an Oracle database so I can't tell if Postgres is also affected by this documentation gap.
[1] https://www.i2b2.org/software/files/PDF/current/CRC_Design.pdf
i2b2 version 1.7.06 was released on August 12, 2015.