Plus or Minus Kakuro

Rules: Enter a single signed digit from 1 to 9 (or -1 to -9) into each empty square so that the sum of the numbers in each Across and Down answer equals the value given to the left or above, respectively. No digit (ignoring sign) is repeated within a single answer. If a clue sum is in a dark gray region, then all corresponding digits have the same sign; if the clue sum is in a light gray region, then the corresponding digits have mixed sign.

Background: I met this puzzle first time in Logic Masters 2007 Qualification.

Example:

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