[CentOS] samab touch file on share no permisson allthough file is written

Hallo,

I ve a samba problem.

I m using a samba server on centos 7.
The share ist mounted by windows 7 and a centos client.
Everything is working but touch filename on the share shows the  
message "no permission" allthough the file is written.
Has anyone a hint for me?

Ralf