Collapse with year and multiple citations

I am using OO 3 and Zotero 1.5 Sync Preview.

I am making a csl for the American Journal of Archaeology style and have following problem when I use the collapse option in citation (<option name="collapse" value="year"/>).

Let's take for example the following two books:
Leick, G. 2003a. Mesopotamia. London: Penguin.
Leick, G. 2003b. Babylonia. London: Penguin.

When I insert those two books as a multiple citation in OpenOffice I get the correct result:
Leick 2003a, 2003b.

But when I add page numbers in the multiple citation then I always get a wrong result:
let's say it should be: Leick 2003a, 33; 2003b, 34-35.
But instead I get: Leick 2003a, 2003b, 33.
i.e. the page numbers of the second citations are ommited altogether and the page numbers of the first book are placed after the second book.

When the collapse option in citation is not used then I always get the correct result:
e.g. Leick 2003a, 33; Leick 2003b, 34-35.

But according to the citation style of the American Journal of Archaeology it has to be:
e.g. Leick 2003a, 33; 2003b, 34-35.

Any help will be greatly appreciated.
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