Reference validation doesn't accept valid values

[esko-piirainen]

• Reference (key=reference, index=59, value="123FOOBAR"): Value "123FOOBAR" is not valid for type Text.
• Reference (key=reference, index=59, value="SF23"): Value "SF23" is not valid for type Text.
• Reference (key=reference, index=59, value="SFH12985678"): Value "SFH12985678" is not valid for type Text.

It accepts "A", "123", "Aa", "Aaaaaaaaaaaaaaaaaaaaaaa".

Doesn't accept these examples from E2020Exchange documentation:
FRP12304560789
HES0A6540321
NOS_200130120021200000_VBA_2