First of all: I'm new to the forum and I'm happy to put my first question here. 
I'm running a vSphere cluster with 3 ESXi Hosts and a vCenter installed on a WIN2008R2 server. One ESXi host is 5.1, one is 5.1u1 and one is 5.5. The vCenter is already 5.5.
Now I have created and installed a VM based on SLES11.3 on the 5.5-based ESXi host. After the OS installation I have installed the VMware Tools which comes with 5.5.
If I run the VM on the 5.5 host everything is fine. If I start it on the 5.1 or 5.1u1 host I'll always get a yellow warning with: "VMware Tools is out of date on this virtual machine. in the WebClient"
But the tools aren't out of date, they are newer than expected by ESXi host.
Is there a possibility to supress this message? E.g. by putting some extra configuration to the VM's vmx-file or by tweaking the VMware Tools configuration in the VM?
Thank you very much in advance!