You need to upgrade the SEEBURGER version to 2.2.1 or higher to implement the use of SHA2 certificate and algorithm. However, you want to know if you can still use SHA1 for signing.
SEEBURGER EDI adapters version 2.2.1 and higher
SEEBURGER, SHA1, SHA2, backwards, compatibility , KBA , XX-PART-SEEB , Seeburger adapters for SAP Exchange Infrastructure , Problem
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