SharePoint 2007 Update List Item Workflow

Question

I have 2 lists that need to run in parallel. When list 1 gets submitted, it automatically needs to fill in certain fields in list 2.

List 1 can be completed on its own as well, however list 2 cannot.

I have set up the 'Create list item' workflow which is all working fine.

However, when items in list 1 get amended, I need it to automatically update in list 2.

I have tried the 'Update List Item' workflow, however there will be no way to determine what item needs to be updated, because list 1 can also be completed on it's own (without the need for list 2) so the ID's will not match.

Does anyone have any ideas how I can achieve this?

Answer 1

Create a hidden field in list 1 and list 2 that has a unique id. So when a item is created in list 1 the hidden id will be put in the item in list 2 by the Create List Item Workflow. Then when you need to update you can search list 2 for that unique hidden id.