There seems to be a bug in VI EXPORTS when Production Management is installed. So far as well can tell it may impact the ability to export any data through VI though the KB only mentions certain tables.
For example, if I try to just export an AP vendor list I get the same error 88.
Normally this isn't an issue because you'd just use Crystal Reports to create an export. However, some third-party solutions make use of VI Exports as a way to generate their interface files ( ACCUPOS is one ) which makes the Crystal workaround impractical.
I can't tell what versions this may apply to. I have a customer on v2020.2 that this is happening to after we installed PM.
Error 88 VI_Export_ui.pvc line 1001 when running Visual Integrator Export job