ASAPCryptoAlgorithms no key pair for Owner

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When verifying a signature, where the signer is the Owner of the passed ASAPKeyStore a ASAPSecurityException is thrown.
"No key pair for xy"

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public void ASAPCryptoAlgorithms_verify_Owner() throws ASAPSecurityException {
    String owner = "Test";
    InMemoASAPKeyStore inMemoASAPKeyStore = new InMemoASAPKeyStore(owner);
    inMemoASAPKeyStore.generateKeyPair();

    byte[] data = new byte[]{1,2,3};
    byte[] signature = ASAPCryptoAlgorithms.sign(data, inMemoASAPKeyStore);

    ASAPCryptoAlgorithms.verify(data, signature, owner, inMemoASAPKeyStore);
}