Error on data source template about Maximum value as |query_ifSpeed|

[Rno]

I try to define for interface traffic, the maximum based on the speed of the interface.
So far I have |query_ifSpeed| but get this error once in a while:

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CMDPHP ERROR: Suggested value column error. Column rrd_maximum for Data Template ID 206 is not a compatible field name for tables data_template_data and data_template_rrd. Please correct this suggested value mapping 

It's on a Port-channel:

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AUTOM8 NOTE: Graph Added - Device[sre-b30-130], Graph[sre-b30-130 Po30 - Traffic - Po30 VSS domain 30 --- ], DS[sre-b30-130 Po30 - Traffic - Po30 VSS domain 30 ---] Graphs[sre-b30-130 Po30 - Traffic - Po30 VSS domain 30 --- ], Rule[Traffic Port-channel] 

or a regular interface:

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10/01/2024 11:01:49 - AUTOM8 NOTE: Graph Added - Device[se-pdb-3001], Graph[se-pdb-3001 Gi1/0/25 - Traffic - SRE-B30-130 / WS-C4500X-32 / Te1/1/3 ], DS[se-pdb-3001 Gi1/0/25 - Traffic - SRE-B30-130 / WS-C4500X-32 / Te1/1/3] Graphs[se-pdb-3001 Gi1/0/25 - Traffic - SRE-B30-130 / WS-C4500X-32 / Te1/1/3 ], Rule[Traffic uplink Port] 

Here is the Data template 206:

2024-01-10 13_41_18-Clipboard.png (31.01 KiB) Viewed 1810 times

So I try to change the maximum value with |query_ifHighSpeed|
but then I got this error message:

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Sorry, we could not process your last action.

Save Failed due to field input errors (Check red fields).

And no field is in red, but since I change only one it has to be the maximum value.

How can I fix this, or is it normal ?

Cacti 1.2.26