[TYPO3-dev] Understanding the TCA properties MM_match_fields and MM_insert_fields

[Steffen Kamper]

Hi,

internally MM_insert_fields is filled with MM_match_fields if not 
configured:
$this->MM_insert_fields = is_array($conf['MM_insert_fields']) ? 
$conf['MM_insert_fields'] : $this->MM_match_fields;


As the name say, the MM_insert_fields is used when you insert new 
records, the MM_match_fields only for building WHERE-clause.

So in general it's ok only to use MM_match_fields, i don't have a 
usecase to use different for insert.

vg Steffen