Buffer is too small, see long text error in SRM

Hi Experts,

We are running SRM 5, ECS. Newly created limit PO in DEV system goes error in process throwing error "Buffer is too small, see long text". Goods/Service POs do not have this issue.

I can see its a standard error message Class NR, message number 031 in SRM. Please advice what to do?

BR,

Karthik