Initiate invoice approval for multiple invoice from Manage invoice page in AP

Organization Name (Required - If you are an Oracle Partner, please provide the organization you are logging the idea on behalf of):

ATCO

Description (Required):

 ATCO is looking for option , to initiate invoice approval for multiple invoices from manage invoices page,

the option is coming to select multiple invoices , even option to initiate approval comes, but once clicked on that it gives below error

"This action isn't applicable for the invoice in its current state"

can you please help with the issue

Use Case and Business Need (Required):

Currently in Inspyrus, users can select multiple invoices and Initiate apprvals.

Enhancement Request / Service Request: