Plus42: incorrect behaviour in equation using temperature UOM

[Marco Polo]

I am starting using Plus42 more seriusly and found a glitch regarding the temperature handling in UOM.
Let's take the usual equation for calculating the LMTD of a heat exchanger:

Code:

'LMDT:LMDT=(DThot-DTcold)/LN(DThot/DTcold)'

Solving for LMDT having, for example

Code:

DThot = 9_°C
DTcold = 6_°C

it shall give 7.3989_°C, as it happens in 48/50 series.
On Plus42 the result is incorrectly -265.751_°C

Apparently 273.15 is subtracted to the correct result expressed in °C.

This behaviour is present in Plus42 v.1.1.11

Cheers
Marco Polo