Update the description field of an AP invoice - Run Update statement

Dear SAP users,

I am looking to update the description field of several AP invoices(one by one) and since the entries in the rows table (PCH1) cannot be retrospectively edited, i was hoping to run an update statement in order to change these. I could alternatively cancel the invoices and rebook them, but this is messy and cumbersome.

Since i've never run an update statement myself, i was hoping to get a draft of how the update statement is formulated. I know that it is run from the query generator (preview) but the exact syntax i do not know.

Would highly appreciate any assistance here.

Best regards,

Marvin