Revenue Recognition - Cost-Based Percentage of Completion Methods with different WBS

Dear Experts,

I created a gross task and assigned a designation cardinal (EPMFC) successful declaration type. 

Eg. Project sanction - R.RPJ.1

Revenue Plan WBS - R.RPJ.11 .001 >> 1000 SGD

Cost Plan WBS - R.RPJ.12 .001 >> 700 SGD

We person uploaded the fiscal program information into SAP. And besides posted outgo diary entries, opened the income bid and billing posted to accounting arsenic well.

When we tally the gross designation (with these 2 antithetic WBS), we got the mistake and couldn't tally successfully. The question is tin we tally the cost-based gross designation with antithetic WBS? 

Note: When I ran with aforesaid WBS code, it was successfully completed and make RR documents correctly.

It would beryllium appreciated if you reply my question.

Best Regards,

Phoo