diff --git a/src/defaultSkills/process-incoming-product-and-invoices.SKILL b/src/defaultSkills/process-incoming-product-and-invoices.SKILL
index 5c20992..ca683d8 100644
--- a/src/defaultSkills/process-incoming-product-and-invoices.SKILL
+++ b/src/defaultSkills/process-incoming-product-and-invoices.SKILL
@@ -2,4 +2,25 @@ Process Incoming Product and Invoices: use draft_delivery_manifest tool to store
 
 # Overview
 
-use draft_delivery_manifest tool to store parsed invoice
\ No newline at end of file
+first task a subagent to find "lieferant_id using GET /supplier" using information in the data.
+
+then task a subagent to find existing links with articles using "`POST /supplier/{id}/articles` Params: `id: int, body?: { skus?: str[] }`" with all the SKUs of that supplieer we have in the data.
+use the existing linked data to besser match vpe
+
+finally call draft_delivery_manifest
+
+- manifestType: "rechnung" or "lieferschein". For "lieferschein", prices and taxes must be null.
+- Exclude non-product lines (shipping, handling, etc.).
+- Line items: Count, vpe (default: 1), liefArtNr, mwst (7 or 19), and eknetto per Item(euro cents).
+- Match supplier against . For unknown suppliers, extract lieferantName and set lieferant_id to null.
+- Write notes strictly in German.
+
+VPE (Verpackungseinheit) Logic:
+VPE represents the number of individually sellable units inside a bulk item as sold by the store. If not explicitly split for individual sale, default to 1.
+- "20 Boxen á 10 Stück" -> VPE = 20.
+- "10 Gläser á 100 Filter" -> VPE = 10 (we sell the 10 glasses individually).
+- "100 Stück" -> VPE = 1 (sold as one bulk pack).
+- We don't sell the individual filters or Pieces, but typical VPEs like Beutel, Glässer, Boxen, Hefte
+- That means that in "Y Hefte á X Blatt" the VPE is NOT X but: Y
+- a so called "Display" also means VPE. So "20er Display" means VPE = 20
+- eknetto is the price of one full vpe