Data upgrad 2 AX 2.5s into 1 Ax 3.0

Hi i have a question about upgrading Ax. 2.5 → Ax. 3.0 I have 2 installations with different software developments. I want to keep both in one instance… thats not the deal … but when i want to migrate the data, i get a problem with duplicate ids… Eg: Table PIRMIN1 in Ax 2.5 1. installation has id 3000 Table PIRMIN2 in AX 2.5 2. installation has also id 3000 … which makes data upgrad fun … any ideas how to change (even manually) the Id in the old app? Result should be : Table PIRMIN1 in Ax 2.5 1. installation has id 3000 Table PIRMIN2 in AX 2.5 2. installation has also id 3001 THX Pirmin