EMS web services: update memory segment

Hello.

I'm trying to create a new Entitlment using EMS web service function called from c# code.

I have a problem in tryng to update values in RO memory.
In my cases I'm using 2 cells of RO memory with memory offset 0x002C.

The new Entitlement seems to be created correctly. I'm able to see it in EMS. but when I try to change its state from draft to queue I obtain an error message from EMS: "memory data is either not available or larger than provided space".

But in XML provided in Entitlement creation  I've written the part relative to memory:
<memorySegment>
           <name>AAAA</name>
           <description>BB</description>
           <text>3131</text>
           <size>2</size>
           <offset>0X002C</offset>
           <color>#f43090</color>
           <saot>true</saot>
           <memoryType>
                       <id>2</id>
           </memoryType>
</memorySegment>

Someone could give a suggestion?
thanks in advance

Luke