That stage of the posting process is not available for scripting. 

You can use the Company Maintenance features to help with date control (while keeping up with Period End processing), but you're still controlling things manually.

We've modified Register reports to print bold red text at the top during certain error conditions, but again: manually controlled (easily ignored).

Hi Kevin,

Thank you for your support. Our user put multiple AP invoices with different invoice date (different month) into one PO receipt batch, and some time select wrong posting date from posting date pop up form too, how can I add pre write script to compare the posting date with all these invoice date before final posting, we want they are all in the same month. This screen system information is GL_CompanyActiveBatch, but I can not find any events related to this table