Exporting and importing transformation between repositories gives error re distribute

I export a transformation from one db repository then import it into another. When I try to save the new transformation I get:
ERROR: column "distribute" is of type boolean but expression is of type character varying

I get the same error if I copy the transformation to the clipboard and paste it in the other repository.
The XML contains many instances of <distribute>Y</distribute>, which would be whether the step should distribute rows to the next step.

I have tried changing the distribute values (in the XML) to 0 and 1, also true and false.

How can I get the transformation copied properly between the two repositories?

(I am using GeoKettle 2.5)