3768757 - Error message 'item category 04000 not allowed in accounting transaction 0300/0001' ( GLT2001)

When posting a supplier invoice against a purchase order, the system raises error GLT2001: “Item category 04000 not allowed in accounting transaction 0300/0001.”

SAP S/4HANA Cloud Public Edition

1. Open the Create supplier invoice APP.
2. Enter the reference Purchase Order and mandatory details 
3. Execute the simulation/posting.
4. Observe that message GLT2001 “Item category 04000 not allowed in accounting transaction 0300/0001” is raised and posting is blocked.

Incorrect customizing.  
In Finance, document splitting map particular keys to cash item category 04000. These can be used only in that context, it is not permitted to use these keys for other business transactions eg: supplier invoices. 
In the configuration node 'Define Account Key in Purchasing' (SSCUI 106701) it is possible to create custom account key for pricing. These keys can then be assigned to conditions in the pricing procedure for account determination purposes. 
The following account keys are currently in use in existing financial business processes.
Please do not create any of these keys listed below, for use in your custom pricing procedures, as you will NOT be able to post supplier invoices with these keys   

ActKy Decription
ZA1   Payt trans. residual item carry-forward
ZA2   Payt trans. residual item carry-forward
ZA3   Neutral residual item carry-forward
ZAF   Payment requests
ZBA   Payment program: bank posting
ZDI   Payment differences by reason
ZKB   Provisions/Recs/Payables: Discount Exp.
ZKK   Provisions/Recs/Payables: Discount Tfr
ZWE   Payt program: bill exch/bill payt reqst
ZWO  Payt program: bank bill liability

1. If you have one or more purchase orders affected by this
2. Reverse all follow on documents, goods receipts or invoices etc
3. Change the purchase order to remove any condition which has an unsupported Account key 
4. Re-post the follow on documents without the problem condition. 
5. For future documents, copy the existing pricing procedure to a new one and replace the reserved Account key(s) with a new non‑reserved key (example, Z01, Z02) 
6. Assign the new pricing procedure in purchasing so that newly created purchase orders pick up the new pricing procedure. (old PO's remain unaffected by the change) 

• Refer to the configuration help of 'Define Account Key in Purchasing' (SSCUI 106701) 
• Refer to: 2814950 - GLT2001 - Item category &1 not allowed in accounting transaction &2/&3
• Refer to: Item Categories Used in Document Splitting

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