Technical Monitoring - Customer Metric stays grey

Hi experts,

I did create a customer metric (RFC PULL) which reads data from an RFC-FM.

I did create a rfc-pull template and did assign this to an customer metric and alert.

However, the metric always stays grey.

If I change the measurement to "Counter Threshold" it changes to red and displays value "0".

When I open the detailed metric i can see the correct values.

If I test the rfc pull metric with report AC_ALRT_ANALYSIS_TOOLS I get all values correct.

So the FM seems to be fine.

But I don't know how to go on, how to analyze further.

Kind regards