Posting PO in AX

Dear friends,

I encounter the problem below everytime I try post a PO. Pls help me to find a solution.

Thank you in advance.

This is in Dynamics AX 2012

Seetha,

This is the last warning. Start using better subjects!!! I told you that yesterday! Urgent - Help Needed is not helpful - especially since it’s exactly the same as you used yesterday!

Looks like you have modified the system, get a developer to debug and explain the issue.