Saves the current document with it's modifications. Special version only to be used inside WGAPI, e.g. for createClone.
@param lastModified Date of last modification to set (if this is supported by the implementation)
@return true, if the saving succeded, false otherwise.
@throws WGAuthorisationException
@throws WGValidationException
@throws LockException - instance of ResourceIsLockedException if a process try to modifiy a locked object without obtaining a lock
@throws WGSystemException
@throws WGIllegalArgumentException
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