Which text messaging app are you using @chud ?
The native Samsung variant or a 3rd party one ?
There should be no reason why you can't delete a text message.
Has this just started happening i.e have you been abke to delete texts before.
You could try clearing the cache of the messaging app via Settings, Apps, Choose App, Storage, Clear Cache and jf necessary clear data.
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "