Software component computed value data type

I have the following error saving a blueprint when setting a computed value to bind to a string value on another software component.

Component [Wp_Database_1] has property [Wp_Database_1~db_password] that refers to [MySQL_1~dbpassword] which has different data type.

Basically the component MYSQL_1 puts a value into the dbpassword computed property. This is just done through a normal bash variable assignment.

it lets me save the blueprint with _resource~MySQL_1~dbpassword as the binding value in Wp_Database_1 db_password, but the blueprint will fail when deployed with error "Cannot find resources for field path [MySQL_1]"

i just want a computed value from 1 software component to be passed through to another. What am i doing wrong?