the error screen shot
the #Name? on txtReqID when it is displayed in the datasheet of the split form (it doesn't display open) Can you show what you currently have as the control source?
*i'm not 100% what you mean by binding it to RequisitionID because it goes into a datasheet* Ignore because I couldn't see what you had at the time.
If you can, perhaps uploading a copy of the database would be helpful. But the first thing to check, because I just had this issue with someone else, is to go to the VBA window and to DEBUG > PROJECT and, if it shows you anything other than this line of code, fix it and run again. Keep doing that until you have no more errors or this is the only one. Sometimes the error does not tell the right story and, as in my other thread where the user was getting a macro not found error but it was actually due to a Word reference not being set, it can confuse things.
And one more thing - does RequisitionID actually exist in the ReviewPurchaseOrder Form's record source?
Sometimes it can help resolve some issues is to import (not copy and paste, but import) everything into a brand new database file.