MS Access - 具有多个条件的过滤子表单

Question

I'm trying to filter a subform from within a form with 2 criteria,
Both filters work independently but when I try and put them together I'm getting a 'Type Mismatch' error

Filter 1

Forms!Frm_Department_Job_List_22.[Qry_Department_Job_List_22 subform].Form.Filter = "[WIP] = True"
Forms!Frm_Department_Job_List_22.[Qry_Department_Job_List_22 subform].Form.FilterOn = True

Filter 2

Forms!Frm_Department_Job_List_22.[Qry_Department_Job_List_22 subform].Form.Filter = "[Customer Due Date] <=Date()"
Forms!Frm_Department_Job_List_22.[Qry_Department_Job_List_22 subform].Form.FilterOn = True

Together that doesn't work

 Forms!Frm_Department_Job_List_22.[Qry_Department_Job_List_22 subform].Form.Filter = ("[WIP] = True") And ("[Customer Due Date] <= Date()")
Forms!Frm_Department_Job_List_22.[Qry_Department_Job_List_22 subform].Form.FilterOn = True

Anyone any idea what's causing the error when nested together?

Answer 1

Your filter expression, in fact, is logical conjunction on two expressions

("[WIP] = True") And ("[Customer Due Date] <= Date()")  

The result is Boolean "true/false".

Form.Filter require String, for example:

"([WIP] = True) And ([Customer Due Date] <= Date())"