Messed up my transponder on XP12

Hi there.

Whilst programming up my MCP Pro panel using the Pollypot software for my Bell B412  I think I accidently sent a message of   'sim/transponder/transponder_standby'

I'm using a Reality XP GPS, and now every time I try to activate the xpndr it briefly shows the screen below with 'ENT +ID' in the xpndr box - I've never seen that before. . The xpndr goes into mode Charlie for about a second or two, then goes back to standby.

I've tried sending the sim/transponder/transponder_on message via the MCP Pro, but it has no effect.

NB, this is the same for all models - not just the Bell 412 I was programming up using Pollypot.

So I presume I've written a value into the sim that I shouldn't have. 

1) Any ideas what to correct in XP12....and where?

2) Does anyone know what ENT+ID means

Thanks in advance