can I pass the uid in user.register and have it not create it automatically with auto increment?

i want to create users but not let drupal assign the uid, I will send it , i tried this: but it ignores the uid and automatically creates the next available one. How can I avoid this? thanks, diana

<?xml version="1.0"?>
<methodCall>
   <methodName>user.register</methodName>
   <params>
     <param>
       <struct>
         <member>
           <name>name</name>
           <value><string>candy.ruiz12</string></value>
         </member>
         <member>
           <name>mail</name>
           <value><string>candy.r@eeuwkern.org</string></value>
         </member>
         <member>
           <name>pass</name>
           <value><string>candy9223</string></value>
         </member>
       <member>
           <name>uid</name>
           <value><string>12930</string></value>
         </member>
       </struct>
     </param>
   </params>
</methodCall>