SCVMM Unable to assign the subnet because it overlaps an existing one

Hello,
We are using SCVMM to manage an Hyper-V cluster (2012 R2).
When we tried to create a new VLAN we got the following error:
Error (13638)
Unable to assign the subnet 172.22.172.128/25 because it overlaps with an existing subnet.
Recommended Action
Specify a non-overlapping subnet, and then try the operation again.
After revising the rest of subnets we haven't found any overlaps.
We have another VLAN defined with 172.22.172.0/25
I've checked with a CIDR calculator and the IP Range is not overlapped.
How can we define both VLANs with their corresponding Subnets?
Regards

Hi Pep,
Have you tried a different range just to check there is not something overlapping that's been missed?
I have a single C class range I then subnet up further in our SCVMM deployment depending type of VM with no issues. With associated IP Pools sat on top. In fact I have just added your two ranges with two different VLANs with no issues. 
The 255.255.255.128 or /25 subnet breaks your IP range up into 0-127 and 128 to 255 as expected. There is no difference to this and further sub netting a B or C class range for a normal enterprise deployment. Granted its not a default class and
will give you two different subnets but that's correct behaviour and shouldn't be an issue in SCVMM assigning each as a separate VLAN.
Kind Regards
Michael Coutanche
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