Allowing quantity internal inconsistency

Quantity interval elements can have different property assigned for lower and upper, what doesn't make much sense since the interval should have the same units for lower and upper bounds:

ELEMENT[at0020] occurrences matches {0..1} matches { – Quanitty interval
value matches {
DV_INTERVAL<DV_QUANTITY> matches {
upper matches {
C_DV_QUANTITY <
property = <[openehr::129]>
>
}
lower matches {
C_DV_QUANTITY <
property = <[openehr::124]>
list = <
["1"] = <
units = <"mg">
magnitude = <|1.0..1000.0|>
precision = <|1|>
>
["2"] = <
units = <"gm">
magnitude = <|1.0..100.0|>
precision = <|1|>
>
>
>
}
}
}
}