Triggering workflow more than once during wait hrs

Dear All,

We have implemented two Z (ZAPFI_INV, & ZFI_INV_PARK) workflows for FI

park invoice. ZFI_INV_PARK is the query workflow and ZAPFI_INV is the

approval workflow.

Both workflow start with checking whether if image (i.e. FI invoice) is

attached with the document or not. If the image is not attached, the

workflow will wait 3 hrs for the image attachment. If the image gets

attached within 3 hrs, workflow will move further for approval or query

process.

But if the same document is "parked" or "save-as-completed" more than

once within the waiting time frame of 3 hrs, then more than one

workflow process starts & resulting same WI more than once in the useru2019s inbox.

Kindy advice.