3026039 - Error KI249 when creating a Purchase Order

When creating a Service or Material Purchase Order with account assignment, you can´t save the purchasing document due to error:

KI249 (enter only one true account assignment).

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ecc, account assignment, me21n, me51n,controlling , not defined a CO account assignment, Default Cost center, cost element, CO object, OKB9, OKC9, Automatic account assignment, KI 249, purchase requisition, network, , KBA , MM-PUR-GF-ACC , Account assignment , MM-PUR-PO-GUI , Userinterface - Purchase Orders , CO-OM-CEL-E , Postings , MM-IM-GF-COBL , CO Account Assignment , Problem