svnadmin dump and load - Relative source revision is not available in current repository

In an attempt to reduce the size of our repository I've tried a dump and
load cycle as follows.

> SET REPOSSRC=C:\Documents and Settings\readonly\Desktop\SvnRepos
> SET REPOSTRG=E:\Deneme\TargetRepos
>
> SVNADMIN create "%REPOSTRG%"
>
> SVNADMIN dump "%REPOSSRC%" -q -r 15001:15500 > DUMPFILE.DAT
>
> SVNADMIN load "%REPOSTRG%" < DUMPFILE.DAT
>
> EXIT /B 0

But I consistently get an error message like this.

> Relative source revision -778 is not available in current repository

Same results on both Windows 2000 Server, SVN 1.4.3, and Windows XP, SVN
1.3.2.

Is this behaviour correct or am I doing something wrong?

-- 
| Tarkan Taralp
| TÜBİTAK MAM BTE, PK. 21, Anibal Caddesi, Gebze, Kocaeli 41470
| Elm: tarkan.taralp@bte.mam.gov.tr
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