Check your device page - there should be a setting in there which allows to you adjust the pulse configuration. It’s definitely exposed if you’re using Zigbee2MQTT.
Not sure if it’s the same on ZHA - if it’s not, you might be able to send a cluster command to change it, but you’d need to know the correct cluster to send the command to.
EDIT: Had a look at the Z2M code and the cluster you’re looking for is called seMetering (probably listed as 0x0702 in ZHA). If you read the cluster and it returns 1000 as a result, you know you got the right one.
These devices are integrated via ZHA or Z2M - there’s nothing the supplier can do.
I really appreciate your help.
I found the cluster 0x0702, but I’m not sure which attribute that I need to change.
There is one called “divisor”, but when I try to change from 1000 to 4000, it returns always 1000.
After I posted the above, I noticed there’s a specific thread about this device to which you replied to.
There’s a few suggestions in it which explain what worked and what didn’t for other people. I suggest you follow the advice listed in that thread, including using ZHA toolkit