Limit the number of moving files per rule-processing

Hi Folks,
following Situation / Vision for Workflow
I have an "Inbox-Folder", which will be filled automatically with some Files (100+) and an "Processing-Folder" (has not contain more than 3 Sub-Items (Files/Folder).
In the Processing Folder i'm Processing something. (renaming, zipping, whatever)
When I'm Finish with my Proecessing, the Item (File/Folder) while leave the the "Processing-Folder" forever.
Now i've setup a Ruleset which is moving files from the "Inbox-Folder into the "Processing-Folder", when the number of Items (Folders/Files) is less than three.




Most of this Ruleset is working nice.
With the exception of the Moving/Refill-Part of the "Processing-Folder".
When the Rule start Moving Files from Inbox to Processing-Folder, Hazel moves all Files that match.
For this Rule i need, that Hazel is moving only one File per Rule Processing (the First) file which is fitting the parameters (Size is not 0 bytes).
Any Ideas?
following Situation / Vision for Workflow
I have an "Inbox-Folder", which will be filled automatically with some Files (100+) and an "Processing-Folder" (has not contain more than 3 Sub-Items (Files/Folder).
In the Processing Folder i'm Processing something. (renaming, zipping, whatever)
When I'm Finish with my Proecessing, the Item (File/Folder) while leave the the "Processing-Folder" forever.
Now i've setup a Ruleset which is moving files from the "Inbox-Folder into the "Processing-Folder", when the number of Items (Folders/Files) is less than three.




Most of this Ruleset is working nice.
With the exception of the Moving/Refill-Part of the "Processing-Folder".
When the Rule start Moving Files from Inbox to Processing-Folder, Hazel moves all Files that match.
For this Rule i need, that Hazel is moving only one File per Rule Processing (the First) file which is fitting the parameters (Size is not 0 bytes).
Any Ideas?