I believe this has to do with the fact that this is not the final amount of the claim. The claimant has the right to press the claim further.
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without prejudice > bez wpływu na późniejsze rozstrzygnięcia, bez wpływu na dalszy bieg sprawy
http://www.proz.com/?sp=gloss/term&id=20630326

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Note added at 3 hrs (2015-12-11 14:46:38 GMT)
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Without Prejudice

Without any loss or waiver of rights or privileges.

When a lawsuit is dismissed, the court may enter a judgment against the plaintiff with or without prejudice. When a lawsuit is dismissed without prejudice, it signifies that none of the rights or privileges of the individual involved are considered to be lost or waived. The same holds true when an admission is made or when a motion is denied without prejudice.

The inclusion of the term without prejudice in a judgment of dismissal ordinarily indicates the absence of a decision on the merits and leaves the parties free to litigate the matter in a subsequent action, as though the dismissed action had not been started. Therefore, a dismissal without prejudice makes it unnecessary for the court in which the subsequent action is brought to determine whether that action is based on the same cause as the original action, or whether the identical parties are involved in the two actions.
http://legal-dictionary.thefreedictionary.com/Without Prejud...