INVALID_FIELD_FOR_INSERT_UPDATE in Salesforce via API -

i trying make batch update salesforce part of data masking project , getting error invalid_field_for_insert_update when try updating fields of particular custom object via api. our custom object has few standard fields , few custom fields. custom fields i'm trying update keep getting denied.

each field i'm trying update either long text area(32768) or text(255). there no lookups, controlling fields, validation rules, nor there field dependencies. able make modifications other objects (account example) via masking process. able make modifications values through web ui on values custom object. i've tried members of api group system administrator.

can please point me in right direction? don't have access source code of masking tool, have elevated rights in sf. in advance advice.

the exact error: invalid_field_for_insert_update error message: unable create/update fields: name. please check security settings of field , verify read/write profile or permission set.

the funny thing i'm not trying update field "name". name seems auto-number field on object, i'm not sure why field change value on update different column.

if 1 facing same issue of not able update name column because has data type name.

there 2 solutions:

1. if want push name of human try pushing firstname , lastname instead. "name" populated automatically.
2. if want push name of product try changing type of name field text. if doesn't work can push name either firstname or lastname, whichever mandatory(just work around).