Hi Georgy
Take a look at
TEC547483 . Too much there to copy here but it explains it for you
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NOTE: If the XOG write xml file includes the <OBSAssocs> tag and OBS definition is NOT associated to the Project Object, the XOG write action will generate an error message. This error message will be generated with no OBS object association and this message will occur regardless of the presence of the 'financialLocation' and 'financialDepartment' attributes in the xml file. If the XOG write xml file does not include the <OBSAssocs> tag with no OBS object association, this message will not be generated.
<ErrorInformation>
<Severity>WARNING</Severity>
<Description>OBS id (mylocation) is invalid. So, the OBS Association was not made.
OBS association has been updated according to financial information.</Description>
</ErrorInformation>
HTH
Owen