Supervision RMS Max. differs from Cubase master meter RMS Max.?

Please help me to understand why Supervision RMS Max. differs from Cubase master meter RMS Max. ?

I set a test generator with a sine wave outputing -18 dB

Supervision shows -18 RMS Max
but the Cubase Meter shows -21 RMS Max

Thank you

What are the settings for each?

From the manual regarding Meter Settings Pane:

In the RMS Settings section, the following parameters are available:

AES 17

Activates the AES17 standard that adds an offset of 3 dB to the RMS value.

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Thank you Mattias, i was not aware of that. Solved!