[TYPO3-irre] Error after upgarde from 4.1.7 to 4.2.2

[Albert van der Veen]

Hi all,

I just upgraded a site to 4.2.2 and now get an error when trying to save 
a record that has inline child records. Error is:

102: These fields are not properly updated in database: (sourceref) 
Probably value mismatch with fieldtype.

The config for the inline field is as follows:

"sourceref" => Array (		
	"exclude" => 1,		
	"label" => "Some label",		
	"config" => Array (
		"type" => "inline",	
		"minitems" => 0,
		"maxitems" => 10,	
		"foreign_table" => "tx_toolsmanager_onlinesources",
		"MM" => "tx_toolsmanager_toolsets_onlinesources_mm",
		"appearance" => Array (
			"collapseAll" => 1,
			"expandSingle" => 1,
			"useSortable" => 1,
		),
	)
)

The field sourceref is an int and contains the number of children as in 
the doc_core_api, under 4.2 TCA array ref - type inline - key 'MM':

"The field which is configured as “inline” is not used for data-storage 
any more but rather it's set to the number of records in the relation on 
each update, so the field should be an integer."

What could be the problem?

thanks,
Albert