planning sequence error

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Dear Friends,

A generate combinations planning sequence hit an error which I could not understand.

Here are the error & messages in the modeler:

Errors while executing sequence : XYZ

Context information for the other messages

Selection for characteristic ABC : <value>

Selection for characteristic DEF : <value>

Selection for characteristic GHI : <value>

Cannot generate combinations for multiprovider YYY

Cannot generate combinations in step '04'.

Please advise the following:

1. What are the "Selection for characteristic" statements referring to? Can I say the Filter values derived at runtime, for example if the characteristic is filtered using an exit variable?

2. Where can I find out what is step '04' referring to and tell me what is wrong?

I have no such problem in development and quality. only in production.

I vow to award points for any tips suggested.

thanks in advance

YHogan