2696446 - Error "Material number must not be longer than 18" appears in S/4HANA Cloud Public Edition

When you change or save a material number in a target system, one of the following errors appears: 

• "Material number must not be longer than 18" 
• "The length of the old material number must not exceed 18 characters" 

The error can occur in the following apps and API: 

• Create Material app
• Change Material app
• Migration Cockpit app
• API_PRODUCT_SRV API

This affects 3-system landscapes (DEV → QAS → PRD) and 2-system landscapes (QAS → PRD). 

SAP S/4HANA Cloud Public Edition

Product, Configure Product number format, Material number must not be longer than, CE_PRODUCT_0002, MFLE, Material Field Length Extension, CL_PRODNUMFORMAT_DPC_EXT, Compatibility Mode, OMSL, MMNR, MARA-BISMT, MATNR, A2X, MM/092, MM01, MM02, The length of the old material number must not exceed 18 characters, Material number must not be longer than 18, 102320, Define Output Format of Material Numbers, BMG 140 "The material number is longer than the length set", 107338, Migration Cockpit object Product, transport, customizing, 2602, "The length of the old material number must not exceed 18". , KBA , LO-MD-MM-2CL , Product Master for Public Cloud , CA-GTF-TS-LO , Basic Functionalities Material Master , LO-MD-MM , Material Master , Problem