S1 link with error "Message not compatible with receiver state"

Hello Experts.

Need support on Huawei S1 AP setup. SRAN 11

1 S1 link is abnormal and after performing trace, the error is “Message not compatible with receiver state”.

The message seems to be from eNB to MME, so may be some kind of timeout.

Have you traced the MME side?

Is MME receiving the message?

Check with Transmission team.

Transmission is okay, SCTP links are normal.

Any other suggestion?