Interrupt workflow process in process controlled workflow

Hello experts,

In a custom requirement, we need to interrupt the workflow process.

For example, if we have 4 levels of approval. After the 2nd approver has approved the shopping cart, then the workflow process should be kept on hold. Based on a custom interface result, if the condition from another interface is satisfied, then the shopping cart should appear in 3rd approver's UWL.

I tried with triggering interrupt method of class /SAPSRM/cl_wf_apv_facade in save BADI of shopping cart. But it did not work.

Please let me know how can i interrupt the workflow process till some custom condition is satisfied.

Regards,

Yayati Ekbote