[Web API Edit Working Order rejected with reason: ATTACHED_ORDER_LEVEL_ERROR]

It was a limit order. I look at the order level, it  is  a correct numeric value.

I suspect, there is some constraint imposed on the limit level in relation to the market price being traded at the point the order was placed. But I can't find any documentation on this. I would appreciate if you /anyone can shed light on this.

Note: the same limit order was successfully accepted in subsequent API call.

[Web API Edit Working Order rejected with reason: ATTACHED_ORDER_LEVEL_ERROR]

I encountered Web API edit working order (url  \workingorder_otc\DealId  _ rejected with reason:  ATTACHED_ORDER_LEVEL_ERROR.

What are the possible causes for this rejection? Most of the the times I don't gt this error.

[New Web Trading PlatformL: Open Market in New Window]

What is the difference between Open Ticket in New Window and Open Market in New Window?

I there a User Guide for the new web platform? I prefer a proper User Guide; the 'How-To...' can only be a supplement.

[Cannot subscript to chart tick. Over session limit.]

Currently I am also encountering the same problem :
Lightstreamer error: 7 message: Allowed session count reached.

I found this thread on the Internet:
https://forums.lightstreamer.com/showthread.php?2685-error-7-Allowed-number-of-session-reached

Quote

It said:
The Lightstreamer server when runs in DEMO mode allows as many as 20 concurrent sessions. When you try to create the 21st session you get the reported error message.
A full Production license (as well as the Evaluation license) has no limit on concurrent users. 

Can one of IG Tech Support staff confirmed this, is LightStreamer for our Demo account run in Evaluation license mode or Demo mode?

I have been testing using Demo account for a month but never encountered this problem until today, so I suspect there is some 'configuration' error.